Did you know the average American uses 28 pounds of toilet paper a year—that twice as much as someone in France or Italy. If you install a bidet, you will save around 384 trees, So how much water does a bidet use? According to Coco bidet maker Biolife Technologies, a bidet uses an eighth of a gallon of water per wash. So it will raise your water bill a bit, but not much (compare that with a single toilet flush, which uses 4 gallons). You may also want to factor in the labor and grief you’ll save from fewer clogged pipes. And while that’s not wrapped into your water bill, it does put a bidet’s water use into perspective. http://www.beewill.com/smart-toilet-bowl/