In the 1970's many manufacturers had begun to make lower volume flush toilets of about 3.5 gallons per flush. By 1980 these constituted a majority of the toilets sold in the United States.
1.6-gallon models are now standard on new construction, but the older kinds still constitute a majority of those already in use. Even use of 3.5-gallon models saves about 36 percent of the water which would have gone down into the sewer.
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