Drop-A-Brick is the eco-friendly innovation of the old trick of placing a brick in a toilet's tank to save water. However unlike a real brick, Drop-A-Brick won't ruin your toilet. In fact, it actually improves flushing performance, all while saving about 50 gallons a week. If enough people use it, we can save millions of gallons every day. This product is part of a public service announcement encouraging immediate home water conservation during the devastating California drought. The Drop-A-Brick is being produced at cost.