BTW, largest "wastage" of home water are toilets, showers/baths, laundry, dishwasher,... basically in that order. Maybe you should put up a sign (like you see in California in some places) that says "if it's yellow, leave it mellow, if it's brown, flush it down".
And maybe we should stop with the daily (or weekly) water changes (those that do), and make larger changes less often. Would use less water for the same effect/benefit to our tanks.