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As a contractor, I've been selling toilets for a number of years. When the low flow mandate was passed, manufacturers loosely fell into two groups: those with the $ for R & D, and the ones who wished they did. Kohler, American Standard, and Toto produced good products that function well. The others came up with a pile of modifications to their existing china that would make Rube Goldberg blush. Increasing the diameter of the flush waterway, changes to the surface space of bowl water and other engineering changes enable quality 1.6 toilets to work. You can fuss with lots of "fixes" for the older flow toilets, but they're about as likely to be effective as the fine-print ads in the back of Popular Science promising 100 MPG on regular gas with the Platinum plated Optimizer™ that attaches to your air filter and a vacuum hose.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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