The most common cause for a running toilet is overflow water leaking down into the bowl from the tank via the overflow tube. This happens when there’s too much water in the tank. You can adjust the water level by adjusting the height of the float. To lower the water in a toilet with a float arm, loosen or tighten the screw until the float arm lowers. To lower the water in a toilet with a column float attached to the fill valve, loosen the screw or clip, push down the float, and tighten everything back up again.
Another reason for a running toilet is an old flapper that needs to be replaced. When flappers get old, they don’t seal the way they should, and this allows water to pass constantly from the toilet tank into the bowl. To replace the flapper, simply remove the old one and replace it with a new one from the hardware store. Remove the old one by detaching the chain and taking the flapper off the pins on the side of the overflow tube. To attach the new one, connect the chain and attach the sides to the pins.
Tip: Drain the water from the tank before you replace the flapper. Shut off the water supply to the toilet, and then flush the toilet to drain the water.
Tip: If the chain is too long on the new flapper, you may need to shorten it. If it’s long enough to get caught underneath the flapper, you won’t get a good seal, and the toilet will continue to run.
Another cause of a running toilet could be that the refill tube is always pumping water into the bowl. This happens when the tube is too long and isn’t positioned properly. To shorten, pull the refill tube out of the overflow and hold it just above the opening of the overflow. Trim it off at that point and clip it to the side of the overflow tube to keep it in place.
If none of these remedies work, give us a call and we’ll be happy to diagnose and fix the problem.