If your toilet keeps running continuously and pressing or jiggling the flush button or handle does not stop the water flow, the issue is usually caused by a chain that is adjusted too tightly, holding the flapper valve open. Other causes include a warped rubber flapper that refuses to seat properly over the drain hole, or a tangled flush chain catching underneath the flapper seal. Callout type="warning" title="Hygiene Warning": Wear rubber gloves when reaching into tank water. Verification: Remove the tank lid and inspect the flapper to ensure it rests completely flat over the flush valve opening.
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