Toilet Not Flushing Fully: Fix It in 5 Steps

An incomplete flush, where the bowl clears partly but waste or paper remains, is one of the most common toilet complaints in households with hard water or older fixtures. Unlike a completely dead flush, an incomplete flush can be deceptively subtle: the tank drains, the bowl swirls, but the siphon never fully engages and the bowl does not clear completely. Understanding why that siphon fails is the key to fixing it.

A full flush is a precisely timed sequence. The handle lifts the flapper, which dumps the entire tank volume through the rim jets and siphon jet in a matter of seconds. That fast, directed rush of water builds a siphon in the trapway, and the siphon does the actual pulling. If the water volume is too low, the jets are narrowed by scale, the flapper closes before the tank empties, or the trapway is partly blocked, the siphon never reaches full strength and the flush stops short. Each of those causes has a specific and inexpensive fix, and this guide covers them in order.

Research on this site draws on manufacturer flush specifications, independent MaP (Maximum Performance) flush-test scores that measure grams of solid waste cleared in a single pass, EPA WaterSense water-efficiency data, and aggregated owner-review patterns from thousands of verified buyers. We do not run in-house flush tests. Where those sources converge on a repair pattern or a product recommendation, we report it.

What causes a toilet to not flush fully?

Each cause produces a slightly different symptom. A low water level makes the flush feel short and choppy, as if it ran out of steam halfway through. An early-closing flapper produces a flush that starts strong but seems to give up before the bowl clears. Clogged rim jets show up as streaks under the rim and a weak, uneven swirl rather than a full spiral rinse. A partial trapway clog makes the bowl rise before it drains and often produces a slow gurgle. And a bowl that has reached the limit of its design will flush cleanly but shallowly, leaving the same residue every time regardless of what you adjust.

Step 1: Raise the tank water level to the marked fill line

This is the single most common cause of an incomplete flush and the easiest to correct. Every flush uses the full volume of water stored in the tank. When that level falls below the molded fill line, the tank simply does not hold enough water to build a complete siphon, and the flush stops before the bowl clears. Over time, fill valves drift, floats get bumped, or a well-meaning person lowers the level to save water without realizing they are starving the flush.

Look on the inside rear wall of the tank for a molded waterline indicator, usually labeled "water line" or shown as a stamped ridge. Alternatively, the correct level is approximately one inch below the top of the overflow tube (the tall standpipe in the center of the tank). If the resting water is lower than that marker, the flush is underpowered. Adjusting the float restores the level:

• Cup-style fill valve (most toilets made after 2000): Rotate the adjustment screw on top of the valve clockwise to raise the water level. Some models use a pinch clip on the side of the float assembly that you slide up.
• Ball-float fill valve (older toilets): Gently bend the brass float arm upward, or use the adjustment screw where it connects to the valve body, to raise the shutoff point.

After adjusting, flush and wait for the tank to refill. Measure the resting level again. It should sit right at the fill line, not above it. Raising the water above the overflow tube means the tank continuously drains down the tube without adding any flush power, which is wasted water and a running toilet. Even a half-inch gain at or below the fill line can transform an incomplete flush into a complete one. For a detailed walkthrough of restoring power by tank adjustment and other methods, see the guide to improving toilet flush power.

Step 2: Adjust or replace the flapper for a longer hold

The flapper is the rubber or silicone disc at the base of the tank that lifts when you flush. Its job is to stay elevated long enough for the entire tank to drain into the bowl in one fast rush. If it closes early, the flush is throttled at the source. This single part is responsible for a surprisingly large share of incomplete flush complaints, and it is also the part most likely to degrade quietly over two or three years.

Watch a flush from directly above with the tank lid off. A correctly behaving flapper will rise fully, float up as the water level drops, stay open until only an inch or two of water remains in the tank, and then drop cleanly to reseal. If the flapper slaps down while several inches of water remain in the tank, the flush has been cut short. Two things cause this:

• Flapper buoyancy is set too low. Many modern flappers have an adjustable foam float or a dial that controls how much air they trap and therefore how long they float. Turning the float to hold more air extends the open time. Set it so the flapper closes after the last inch of tank water has cleared the bowl.
• The flapper has hardened or warped. Rubber flappers lose their flexibility over time, especially in chlorinated or hard water. A stiffened flapper may close under its own weight before the tank empties. If the rubber feels brittle, shows discoloration, or the seal ring is mineral-crusted, replace the flapper. A universal flapper costs under ten dollars and swaps out in a few minutes with the water shut off.

A correctly timed flapper is one of the highest-leverage fixes in toilet repair. When owners report that their toilet "used to flush fine but gradually got weaker," a flapper that has lost its hold time is the cause more often than anything else. Replacing it with a quality flapper, such as a Korky 100BP or Fluidmaster 502 series, and setting it to hold open for the full tank drain, restores an incomplete flush in most cases without touching anything else.

Step 3: Clean the rim jets and siphon jet with vinegar

This is the fix that most homeowners overlook and that resolves a surprising share of gradual flush deterioration. Under the rim of your bowl is a series of small angled holes, called rim jets or rinse holes, that aim water inward and downward to create the spiral rinse. At the base of the bowl near the front is a single larger hole called the siphon jet, which delivers the focused blast of water that initiates the siphon. Together, these openings direct the full tank volume where it needs to go. When they narrow from mineral scale, the same volume of water is spread thinner and aimed wrong, and the siphon never reaches full pull.

In hard-water areas (defined by the US Geological Survey as water with more than 120 mg/L of dissolved minerals, which covers more than 85 percent of the United States), these holes begin to scale noticeably within one to three years. The flush does not fail overnight; it gets progressively weaker in a way that can seem like the toilet is "just getting old" when the actual fix is a vinegar treatment. Symptoms include streaks of discoloration running down from the rim holes, an uneven swirl that favors one side of the bowl, and a flush that was noticeably stronger when the toilet was new.

To clean the jets:

1. Turn off the water supply at the shutoff valve behind the toilet and flush to empty the tank.
2. Pour two cups of warm white vinegar directly down the overflow tube in the tank. The vinegar will flow through the rim channel and sit in the jets. Alternatively, soak strips of paper towel in undiluted white vinegar and pack them tightly against the underside of the rim to hold the acid in contact with the openings.
3. Let it sit for a minimum of two hours. For heavy mineral buildup, overnight is more effective.
4. Turn the supply back on, let the tank refill, and flush. Use a stiff-bristled toilet brush to scrub under the rim immediately after the flush while the loosened scale is wet.
5. For individual jet holes that remain partly blocked, insert a small wire, a straightened paper clip, or a jet-cleaning tool into each hole to clear the passage. Do not use anything that can break off inside the hole.

After cleaning, a full flush will often show a visibly stronger, more even spiral and a complete bowl clearance where only a weak swirl existed before. In homes with very hard water, this cleaning every three to six months is the most effective maintenance habit for sustaining flush power over the toilet's life. For a broader look at what causes chronically incomplete clearing, the guide to why toilets keep clogging covers the relationship between jet restriction and siphon strength in detail.

Step 4: Clear a partial trapway blockage

If the tank water level is correct, the flapper holds open fully, and the jets are clean, but the bowl still does not clear completely, the problem has moved downstream. A partial blockage in the trapway, the S-shaped ceramic channel that carries waste from the bowl into the drain line, can choke the siphon even when the mechanical side of the flush is functioning correctly. This type of blockage is easy to miss because it does not completely stop the toilet: water still drains, but slowly and incompletely, and the bowl may rise before it falls.

Common partial trapway blockage causes include too much toilet paper compacted in the curved passage, wipes and hygiene products labeled "flushable" that do not break down as advertised, a flushed object (a toy, cotton pad, or other non-waste item), or in older cast-iron drain lines, mineral or rust accumulation that has narrowed the pipe over years.

Clear it in this order:

1. Flange plunger first. A flange plunger has an extended rubber sleeve that folds out to seal into the bowl drain, unlike a flat cup sink plunger. Set it firmly, push down to force air out, then use ten to fifteen steady forceful strokes. Pull up sharply on the last stroke to release the vacuum. For a thorough method, see the complete guide to toilets not flushing properly.
2. Closet auger if plunging does not clear it. A toilet auger (also called a closet auger) is a flexible cable with a protective sleeve that feeds into the trapway without scratching the porcelain. Crank it clockwise to break up the blockage or hook and retrieve the obstruction.
3. Hydro-jet or plumber for persistent blockages. If multiple auger passes do not restore a clean flush, the obstruction may be in the drain line further downstream, which requires professional clearing.

A successfully cleared partial blockage often restores a flush that seemed permanently degraded, and it can eliminate the need for a toilet replacement entirely. If partial clogs recur frequently, a toilet with a larger trapway diameter is a better long-term solution. The American Standard Champion 4's 2-3/8 inch glazed trapway and the TOTO Drake's 2-1/8 inch fully glazed trapway are both specifically engineered to reduce the lodging potential of solids, which is why they score near the top of independent MaP testing. The weak flush fix guide covers how trapway size affects clearing power across major models.

Step 5: Evaluate whether the bowl itself is the limit

When Steps 1 through 4 all check out and the toilet still does not flush fully, the bowl geometry is the honest answer. Not all toilet bowls are engineered equally. Older 3.5 GPF models from before 1994, first-generation 1.6 GPF toilets introduced under the 1992 Energy Policy Act, and lower-priced modern bowls with small trapways or poorly angled jet holes can reach the physical limit of their flush capacity even when every mechanical part is in perfect condition. No adjustment will change that.

The benchmark for evaluating bowl capability is the MaP (Maximum Performance) score. MaP testing, conducted by an independent laboratory, measures how many grams of soybean paste (a standardized solid waste proxy) a toilet clears in a single pass at its rated GPF. Scores run from under 200 grams on weak bowls to 1,000 grams, the maximum for a residential gravity-flush toilet. For a primary bathroom:

• 500 grams or below: Marginal for a typical household. Double flushing is common.
• 600-800 grams: Adequate for most households. Single flush clears the majority of loads.
• 800-1,000 grams: Strong. Single flush clears virtually all residential loads, including large households with heavy use.

If your current toilet has a MaP score below 600 grams, or predates MaP testing entirely, the upgrade math is clear. A high-MaP, WaterSense-certified 1.28 GPF toilet like the models below will clear more waste per flush than the toilet it replaces while using roughly 20 percent less water per year. The EPA estimates that WaterSense-certified toilets save the average household approximately 13,000 gallons of water annually compared to a 3.5 GPF pre-1994 toilet. For the complete ranked list with MaP scores, see the best flushing toilets roundup.

Which toilet has the strongest flush for incomplete-flush problems?

Among currently available gravity-flush models, MaP testing and aggregated owner reviews consistently put the TOTO Drake II and American Standard Champion 4 at the top for outright clearing power. Both achieve the 1,000-gram maximum MaP score. The difference is in design approach: the Drake II uses TOTO's Double Cyclone technology, which fires water simultaneously from two rim nozzles rather than a ring of small jets, producing a stronger and more consistent bowl wash. The Champion 4 relies on a 4-inch flush valve (versus the standard 2-inch) and an oversized trapway to move a high-volume rush of water in a single pulse.

What is a good MaP score for preventing incomplete flushes?

MaP scores are particularly useful because they remove marketing language from the comparison. A toilet advertised as "powerful" or "high-performance" may score 500 grams on an independent MaP test while a less prominently marketed model scores 900 grams. The score also accounts for GPF efficiency, since it is measured at the toilet's rated water volume. A 1.28 GPF toilet scoring 1,000 grams is doing more with less water than a 1.6 GPF toilet scoring 600 grams. For context, the EPA WaterSense certification requires a minimum MaP score of 350 grams for a 1.28 GPF toilet, which means WaterSense certification alone does not guarantee strong clearing power. Always check the published MaP score directly at map-testing.com alongside the WaterSense label.

What is the best toilet for preventing incomplete flushes and double flushing?

Which toilet offers the best value for replacing a weak flusher?

Top replacement picks when the bowl is the problem

When Steps 1 through 4 confirm the bowl itself is the limit, these are the models that consistently deliver complete single-flush clearing based on published MaP scores, manufacturer specifications, and aggregated owner-review patterns.

1

Best Overall

TOTO Drake II Two-Piece Elongated 1.28 GPF

4.8 Strongest single-flush clearing

The Drake II earns its top position through the combination of a 1,000-gram MaP score, TOTO's Double Cyclone dual-nozzle rim system, and a fully glazed 2-1/8 inch trapway that together produce a complete, single-pass bowl clear on 1.28 gallons, eliminating the double flushes that define life with a weak older toilet.

Flush TypeDouble Cyclone (dual nozzle)

GPF1.28 (WaterSense certified)

MaP Score1,000 grams (maximum)

Bowl Height16.5 inches (comfort height)

Warranty1 year limited

Best For

• Households that double flush regularly and want to stop
• High-traffic primary bathrooms needing reliable single-flush clearing
• Upgrading from pre-1994 3.5 GPF or first-generation 1.6 GPF toilets

Not Ideal For

• Small bathrooms: the elongated bowl adds roughly 2 inches of depth
• Budget-constrained replacements where a value alternative is preferred

TOTO's Double Cyclone system fires water from two nozzles positioned at opposite sides of the rim rather than through a ring of small holes. This approach produces a stronger, more even bowl wash than conventional rim-jet designs and is less susceptible to partial blockage from mineral scale, a direct answer to the jet-clogging problem described in Step 3 above. Published MaP testing at map-testing.com confirms a 1,000-gram score at 1.28 GPF, and aggregated owner reviews consistently cite a clean single-flush clear as the most frequently reported satisfaction driver for this model.

The fully glazed trapway reduces friction and mineral adhesion compared to partially glazed designs, which contributes to the low clog rate in owner reports. TOTO's SanaGloss or CeFiONtect ceramic glaze option on select configurations also reduces the surface adhesion that contributes to staining and reduces the cleaning frequency that many owners cite as a secondary benefit of the upgrade.

Expert Take

The Drake II is the recommendation that appears most consistently across published MaP data and owner review aggregation for primary bathroom replacements. Its Double Cyclone system specifically addresses the rim-jet clogging vulnerability that makes older conventional toilets degrade over time. If the diagnostic above identified jet blockage as a recurring cause of your incomplete flush, this model's dual-nozzle design is a structural solution rather than a maintenance workaround.

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Bottom Line: The highest MaP score in its class combined with a rim design that resists the mineral clogging that degrades most toilets over time makes the Drake II the most consistently recommended upgrade for chronic incomplete-flush problems.

2

Widest Trapway

American Standard Champion 4 Two-Piece Elongated

4.6 High-volume single-flush clearing

American Standard's Champion 4 pairs the widest glazed trapway in residential gravity-flush toilets (2-3/8 inches) with a 4-inch flush valve that opens the full tank in a single high-volume surge, producing a 1,000-gram MaP score that eliminates incomplete flushes in demanding household use.

Flush TypeGravity, 4-inch flush valve

GPF1.28 (WaterSense certified)

MaP Score1,000 grams (maximum)

Bowl Height16.5 inches (Right Height)

Warranty10 years limited

Best For

• Households with recurring clog issues needing the widest trapway available
• Large families and high-traffic bathrooms
• Buyers who want a long warranty with a proven track record

Not Ideal For

• Compact bathrooms: the tank sits higher than slim-profile competitors
• Buyers who prefer a quiet, slow-close flush over a forceful rush

The Champion 4's 4-inch flush valve is twice the diameter of a standard 2-inch flapper valve, which means the full tank volume exits in a shorter burst. That concentrated surge produces the hydraulic force that drives a complete siphon even in a bowl that sees heavy daily use. American Standard publishes a 10-year limited warranty on the tank and bowl, which is the longest in this class and reflects the brand's confidence in the mechanism's durability.

The 2-3/8 inch glazed trapway is wide enough to pass a solid mass larger than any standard residential waste load, which is why this toilet appears frequently in owner reviews from large households and in recommendations for families with children who flush non-optimal items. The glaze on the trapway interior reduces the surface adhesion that causes partial blockages to accumulate over time in unglazed or partially glazed designs.

Expert Take

If partial trapway blockages (Step 4 above) were a recurring cause of your incomplete flush, the Champion 4's 2-3/8 inch glazed trapway is the most direct structural solution. No pump-style cleaner or auger session is a permanent fix for a narrow trapway on a toilet that sees heavy daily use. The Champion 4 simply moves more material per flush than any other residential gravity toilet at this GPF rating.

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Bottom Line: The widest glazed trapway in its class combined with a 4-inch flush valve and a 1,000-gram MaP score makes the Champion 4 the go-to recommendation for households where partial clog-driven incomplete flushes have become a recurring problem.

3

Best Value

Kohler Cimarron Comfort Height Elongated 1.28 GPF

4.6 Strong flush at a value position

Kohler's AquaPiston canister valve opens from all 360 degrees and delivers water faster than a standard flapper, giving the Cimarron a MaP-confirmed 1,000-gram flush and consistent single-pass bowl clearing at a value position well below TOTO's comparable models.

Flush TypeAquaPiston canister (360-degree)

GPF1.28 (WaterSense certified)

MaP Score1,000 grams (maximum)

Bowl Height16.5 inches (comfort height)

Warranty1 year limited

Best For

• Budget-conscious buyers who still want a 1,000-gram MaP score
• Primary and secondary bathrooms with heavy daily use
• Wide parts availability at any hardware store

Not Ideal For

• Buyers who want TOTO's rimless bowl styling over a traditional rim
• Households with a history of recurring partial blockages needing the widest trapway

Kohler's AquaPiston canister design removes the hinge-point failure mode of a conventional flapper and opens the full tank from all sides simultaneously, which produces a faster water release than a single-point flapper. The 1,000-gram MaP score puts the Cimarron at the top of the testing scale for reliable single-flush clearing in a standard household, at a lower price than most competitors that reach the same ceiling.

The Cimarron's strong national parts network is a practical advantage: AquaPiston replacement canisters and seals are stocked at every major hardware chain, which matters for long-term ownership. Owner reviews consistently cite the quiet, efficient flush and straightforward installation as the main satisfaction drivers, while the most common complaint is that the one-year warranty is shorter than the American Standard Champion 4's ten-year coverage.

Expert Take

The Cimarron's 1,000-gram MaP score matches the top of the testing scale at a price well below most other toilets that reach the same ceiling. That makes it the strongest value pick in this guide for buyers who want maximum flush confidence without paying a premium brand price.

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Bottom Line: A 1,000-gram MaP score, AquaPiston canister flush, and one of the widest parts networks in the country make the Cimarron the most practical value upgrade for a household tired of an incomplete-flushing older toilet.

4

One-Piece Pick

TOTO UltraMax II One-Piece Elongated 1.28 GPF

4.7 Seamless design, maximum flush power

The UltraMax II brings the Drake II's Double Cyclone flush technology and 1,000-gram MaP score into a seamless one-piece body that eliminates the tank-to-bowl joint where two-piece toilets most often develop leaks or collect grime.

Flush TypeDouble Cyclone (dual nozzle)

GPF1.28 (WaterSense certified)

MaP Score1,000 grams (maximum)

Bowl Height17.25 inches (comfort height)

Warranty1 year limited

Best For

• Buyers who want maximum flush power in a sleek, easy-clean one-piece body
• Renovations where aesthetics and flush performance both matter
• Households that found two-piece toilets difficult to clean at the tank-bowl seam

Not Ideal For

• Buyers with a strict budget: the one-piece premium is real
• DIY installers working alone: one-piece units are heavier to maneuver

The UltraMax II carries the same Double Cyclone flush engine as the Drake II and achieves the same 1,000-gram MaP score, which means flush performance is identical between the two models. The difference is entirely physical: a one-piece body has no seam between tank and bowl, which eliminates the gasket joint that can loosen over time and removes a cleaning surface that collects mineral deposits in hard-water homes.

TOTO's optional CeFiONtect ceramic glaze produces a surface that resists the adhesion of waste, scale, and bacterial film, reducing the cleaning frequency owners cite in long-term reviews. The UltraMax II is consistently the highest-rated one-piece model in owner satisfaction surveys for bathrooms where both visual presentation and flush reliability are priorities.

Expert Take

If the Drake II is the performance benchmark, the UltraMax II is the same benchmark in a form that is easier to keep clean and better suited to a renovated bathroom. The price premium over the two-piece Drake II is real but smaller than many buyers expect. For a primary bathroom that will see the toilet daily for ten or fifteen years, that premium amortizes quickly against the cleaning time saved on a seamless surface.

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Bottom Line: All the flush power of the Drake II in a one-piece body that is measurably easier to clean over the long term, making the UltraMax II the recommended upgrade when both flush performance and bathroom aesthetics are priorities.

5

Dual Flush Option

TOTO Aquia IV Two-Piece Dual Flush 1.0/1.28 GPF

4.5 Water savings with strong full flush

The Aquia IV delivers TOTO's Double Cyclone flush in a dual-flush configuration that uses 1.0 GPF for liquid waste and 1.28 GPF for solid waste, adding meaningful water savings over a single-flush model while maintaining a complete siphon on the full-flush setting.

Flush TypeDouble Cyclone, dual flush

GPF1.0 / 1.28 (WaterSense certified)

MaP Score1,000 grams (full flush)

Bowl Height17.25 inches (comfort height)

Warranty1 year limited

Best For

• Water-conscious households in drought-prone regions or on well systems
• Buyers upgrading from a weak low-flow toilet who also want to reduce water use further
• Households where the TOTO flush quality is the priority alongside efficiency

Not Ideal For

• Households who find dual-flush buttons confusing for guests or young children
• Buyers who prefer a single, simple flush lever over a dual-flush actuator

Dual-flush toilets address the specific incomplete-flush complaint from a different angle: by offering two distinct flush volumes, they allow the full 1.28 GPF to be reserved for solid waste where clearing power matters, while the 1.0 GPF liquid cycle saves water on the majority of flushes. The Aquia IV's 1,000-gram MaP score on the full-flush cycle matches the ceiling of the best single-flush models and is more than strong enough for single-pass solid waste clearing in typical household use.

TOTO's skirted trapway design on the Aquia IV conceals the trapway behind a smooth exterior panel, which reduces cleaning effort at the base of the toilet. Owner reviews cite the clean visual profile and the water savings on utility bills as the main purchase drivers, while the most frequent concern is that houseguests unfamiliar with dual-flush buttons occasionally choose the wrong setting.

Expert Take

The Aquia IV makes the most sense as a replacement when the current toilet's incomplete flush is partly a water-volume problem and water efficiency is also a household goal. On the full-flush cycle it delivers a complete clear for typical solid waste. The 1.0 GPF liquid cycle saves roughly 23 percent of tank volume per liquid-waste flush compared to a 1.28 GPF single-flush model, which adds up to a measurable reduction in water use over a year of daily household use.

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Bottom Line: TOTO's Double Cyclone flush in a dual-flush configuration that meaningfully reduces water use without compromising complete clearing on the full-flush cycle, making it the strongest water-efficiency option in this class.

6

Budget Upgrade

Woodbridge T-0019 One-Piece Elongated 1.28 GPF

4.3 Skirted design, low-cost one-piece

The Woodbridge T-0019 delivers a skirted one-piece design and a 1.28 GPF WaterSense-certified flush at a significantly lower cost than TOTO one-piece models, with a published flush performance adequate for most residential use cases.

Flush TypeSingle flush, gravity siphon

GPF1.28 (WaterSense certified)

MaP ScoreNot independently published

Bowl Height17.5 inches (comfort height)

Warranty1 year limited

Best For

• Budget-focused buyers who want a skirted one-piece visual without the TOTO price
• Guest bathrooms and lower-traffic secondary bathrooms
• Buyers replacing a visually dated two-piece toilet in a renovated bathroom

Not Ideal For

• Primary bathrooms with heavy daily use needing a verified 800+ gram MaP score
• Households where the incomplete flush is caused by a genuine bowl-design limitation rather than a mechanical part

The T-0019 occupies a different tier from the TOTO and Kohler models above. Woodbridge does not publish an independent MaP score for this model, which makes flush performance harder to verify against a single number. Aggregated owner reviews report satisfactory single-flush clearing for typical household waste in secondary bathrooms, while a minority of reviews from high-use primary bathrooms note occasional double flushing on larger loads.

The skirted trapway design conceals the base of the toilet and simplifies cleaning, which is the primary reason buyers choose it over a comparably priced exposed-trapway alternative. The one-year warranty is standard for this price tier. Parts availability is more limited than TOTO or Kohler, so factor that into a long-horizon decision about where in the home this toilet will be installed.

Expert Take

The T-0019 is a reasonable choice for a guest bathroom or a bedroom bathroom that sees light use, where the budget constraint is real and the primary driver is replacing an outdated visual rather than solving a chronic flush-power problem. For a primary bathroom where an incomplete flush has been a recurring issue, I would spend the additional amount to get a verified MaP score of 800 grams or higher from Kohler, TOTO, or American Standard.

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Bottom Line: A skirted one-piece design and WaterSense certification at a budget position make the T-0019 a practical visual upgrade for low-traffic secondary bathrooms, but households dealing with chronic incomplete flushes in a primary bathroom are better served by a model with a published MaP score.

7

Runner-Up

TOTO Drake Two-Piece Elongated 1.28 GPF

4.7 Reliable workhorse, strong flush history

The original TOTO Drake uses a G-Max gravity flush system and a fully glazed 2-1/8 inch trapway to deliver reliable, complete single-flush clearing across years of aggregated owner reports, making it the right call when a proven long-term track record matters as much as the latest flush technology.

Flush TypeG-Max gravity flush

GPF1.28 (WaterSense certified)

MaP Score800 grams

Bowl Height15 inches (standard) or 16.5 (Right Height)

Warranty1 year limited

Best For

• Buyers who value a long track record of reliability over the newest flush technology
• Households replacing a toilet in a 12-inch rough-in bathroom with standard sizing
• Value buyers who want TOTO quality at a lower position than the Drake II

Not Ideal For

• Households where the Drake II's Double Cyclone rim design is specifically needed to reduce jet-clogging maintenance
• Buyers who want maximum MaP score: the Drake II's 1,000 grams is a measurable step above 800 grams for heavy use

The original Drake has been in production long enough to have owner reviews spanning more than fifteen years, which is a data set that newer models cannot match. That long track record consistently shows complete single-flush clearing, low clog rates, and a service life well beyond ten years when parts are maintained. TOTO's G-Max system uses a 3-inch flush valve and a tower-style flushing mechanism that is mechanically simpler than the Double Cyclone configuration.

For households where the incomplete-flush problem was identified in Steps 1 through 4 as a tank or jet issue (not a bowl design limit), the original Drake is a strong replacement option at a lower position than the Drake II. Its G-Max flush is less technologically complex and has a longer owner-review track record, which matters to buyers who prioritize long-term reliability data over published test scores from a newer model.

Expert Take

The Drake is the recommendation when budget matters and the household does not have a history of recurring partial clogs or extreme daily use. Its G-Max flush with a fully glazed 2-1/8 inch trapway handles typical household waste reliably, and its fifteen-year owner review history is a form of validation that independent test scores alone cannot provide.

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Bottom Line: A fifteen-plus-year owner review track record of reliable complete flushing and TOTO's fully glazed trapway make the original Drake a confident recommendation for buyers who want proven performance without paying the Drake II premium.

How to maintain a complete flush after fixing the problem

Whether you repaired the existing toilet or replaced it, the same three habits sustain complete flush performance over the long term.

Clean the rim jets on a quarterly schedule

In hard-water homes, mineral scale rebuilds in the rim jets within months of cleaning. A quarterly vinegar treatment, pouring warm white vinegar down the overflow tube and letting it sit overnight, costs nothing and prevents the gradual narrowing that caused the incomplete flush in the first place. In very hard-water regions (more than 200 mg/L dissolved minerals), monthly is more realistic.

Replace the flapper before it hardens

A proactive flapper replacement every three to four years costs less than ten dollars and prevents the early-closing problem described in Step 2 from recurring. A fresh flapper holds open fully for the entire tank drain, which is the timing that produces a complete siphon. Waiting until the flapper visibly fails means weeks or months of degraded flush performance before the problem is diagnosed.

Flush only waste and toilet paper

Wipes, paper towels, cotton products, and hygiene items do not break down in the trapway the way toilet paper does. Even products labeled "flushable" are associated with partial blockage accumulation in plumbing surveys. The clearest path to sustaining a strong siphon is keeping the trapway free of materials that do not dissolve.