Australian-based Caroma sells an inventive dual flush toilet, which offers two different flushes for liquid or solid waste. (Flush number one takes only 0.8 gallons, while flush number two uses 1.6.) According to the EPA, the average family uses 280 gallons of water a day, and toilets account for about 27 percent of that. Even if you already have a 1.6 GPF toilet, switching to a dual flush will save you 28 gallons a day, adding up to 10,000 gallons a year! Caroma’s Dual Flush costs slightly more than a standard toilet, but you’ll make your money back over a few years in reduced water bills.