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Aquanotion's Two Flush system replaces your old tank with one that has a dual flush capacity. A full flush uses 2.2 gallons (9 liters) of water, while a half flush uses only 1 gallon (3.8 liters). Installation is a do-it-yourself project, but if the idea of tinkering with your toilet tank intimidates you, a plumber should be able to complete the job within an hour. To be Two Flush compatible, your toilet must be a two piece, with the handle stationed on the left front of the tank. Its tank must be at least 13 inches tall, 16 inches wide, and 6 inches deep. The company has a number you can call if anything goes awry or if you have any other questions: 1-866-TWO-FLSH (896-3574).