QUIKRETE is having a contest for the best project using one bag of concrete. (Not a sponsor.) I decided to make a “toilet tank top sink.” I first saw the idea on toilets in Japan.

When you flush the toilet, the fill water is re-routed to a faucet (don’t worry, it’s perfectly clean). You wash your hands like normal, then watch the water drain directly into the toilet tank. Next time you use the bathroom, the recycled water flushes the toilet and clean water is dispensed from the faucet. The design saves an estimated 1 gallon of water per person, per day! No modifications are made to the toilet except for routing the fill water tube into the bottom of the faucet.

Hopefully it’s good enough to win the $2500 dollar prize 🙂