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Regarding WaterSenseÂ® ('WS') qualified tank-type toilet fixture models: The WaterSenseÂ® certification protocol requires toilets to flush at least 350 grams of MaP test media. If a higher MaP score has not been achieved, the toilet model is listed with a score of 350. However, in those cases where a toilet model has achieved a higher score on the full MaP test, the actual score is indicated.