Update your toilet--in 1992, a law was passed that outlawed 3.5 gpf primitive toilets in favor of a new standard of low flow 1.6gpf toilets. So, if your toilet was installed before 1992, you should definitely upgrade. Consider a dual flush toilet that has a .8gpf option and you'll reap even more savings. (I bought Toto Aquia dual flush and it is awesome!)If you don't want to invest in a new toilet (honestly, the investment will pay you back within a year in water savings) try putting a brick in your water tank.
