To fix a phantom flushing toilet (where the tank periodically refills on its own), you must eliminate the slow internal water leak. Shut off the water supply valve, flush the toilet to empty the reservoir, and remove the old rubber flapper. Clean any mineral scale or slime from the flush valve seat rim, and snap a new standard rubber flapper onto the mounting ears. Ensure the flush chain has about 1/8 inch of slack so the flapper seats perfectly flat. Callout type="warning" title="Hygiene Warning": Wear rubber gloves when handling internal tank parts. Verification: Add food coloring to the refilled tank and confirm no colored water enters the bowl for 15 minutes.
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