All toilets are not Created Equal

"The Maximum Performance (MaP) testing project was undertaken in 2003 in order to identify how well popular toilet models perform using a realistic test media. The testing protocol, cooperatively developed by water-efficiency and plumbing fixture specialists in the U.S. and Canada, incorporated the use of soybean paste as a test media, closely replicating the "real world demand" upon fixtures. Performance testing of 80 different toilet fixture models was completed and summarized in the Final Report of December 2003.

Now in its 15th edition, the current MaP testing report provides performance information on over 1,200 different toilet fixture models. Many of these models are WaterSense-certified high-efficiency toilets (HETs)."

Taken form the Alliance for Water efficiency Website.