How to Fix a running toilet with This Old House

Watch this video from This Old House to learn how to fix a running toilet.

Steps:

1 Turn off the water at toilet's shut-off valve.

2 Remove the rubber flapper from flush valve inside the tank.

3 Inspect flapper for damage or discoloration.

4 Check location of float on chain; adjust float to height of water level.

5 If adjusting float doesn't solve problem, or if there is no float, install a new flapper.

6 Flush toilet and check to ensure new flapper creates watertight seal with flush valve.