Switching to a low-flow toilet can save thousands of gallons of water over the course of a year. Homeowners are often reluctant to replace their toilet because they have heard that new toilets do not flush as well as older models. According to federal guidelines, toilets cannot use more than 1.6 gallons of water. Today, there are even high-efficiency toilets available that only use 1.1 gallons per flush. When the new guidelines were first enacted, manufacturers had to design toilets that would meet this requirement but still get rid of waste. It is true that some of the first low-flow toilets did not do this effectively. After numerous consumer complaints, the manufacturers went back to the drawing board and came up with a pressurized toilet tank system. Although the toilet looks like a standard residential toilet, it operates like a commercial toilet. When flushed, the pressure inside the tank forces a surge of water into the bowl, which clears away the waste. The only drawback to these toilets is that they are not as quiet as conventional models. American Standard, Eljer, and Kohler all make good quality low-flow toilets.