To stop a phantom flushing toilet, you must address the source of the internal tank leak. First, shut off the water supply valve and flush to drain the tank. Inspect the rubber flapper valve; if it is pitted, rigid, or warped, unhook it from the flush valve tabs and snap a brand-new standard flapper into place. Second, check the flush chain to ensure it has about 1/8 inch of slack so it never holds the flapper slightly open. Callout type="warning" title="Hygiene Warning": Wear rubber gloves when reaching into tank water. Verification: Add food coloring to the tank and confirm zero colored water seeps into the bowl after 15 minutes.
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