If your toilet runs when not in use you could be wasting an extra 250 gallons of water each day. To stop this annoying and noisy problem remove the lid from the tank. Flush the toilet and lift the flapper (the rubber cap at the bottom of the tank). This will prevent refilling. Now, using a microfiber cloth, rub the bottom of the flapper as well as the hole beneath the flapper. This helps to remove any debris that has been preventing a tight seal. The endless running should stop and save you money.