video: http://www.youtube.com/watch?v=7kulnVSG0FY
instructions: http://www.instructables.com/id/Hack-a-Toilet-for-free-water./
This is awesome... since toilet flushing contributes to 30% of the total household usage, people are being creative to save water for using toilets. There are water dams, water tank banks, low-flow toilets.. etc.. but by far i think this is the most creative while keeping the cost low. You don't have to change your toilet for this one.
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