To get a running toilet to stop, perform a quick inspection inside the tank. First, check if the flush chain is caught under the rubber flapper, preventing it from sealing. Second, check if the chain is adjusted too tightly, holding the flapper open; adjust the clip to give the chain about 1/8 inch of slack. Third, if the rubber flapper is warped or pitted, replace it entirely with a new flapper matching your flush valve size. Callout type="warning" title="Hygiene Warning": Wear rubber gloves when reaching into tank water. Verification: Watch the flapper drop flat over the drain opening and listen for the water flow to cease completely.
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