The single most common problem associated with FluidMaster toilet fill valves is mineral scale sediment accumulation or debris getting trapped under the rubber diaphragm seal inside the valve cap. Over time, calcium deposits from hard water prevent the internal seal from closing fully, resulting in a continuous, annoying whistling sound or a slow trickling leak where the tank never stops refilling. Verification: Inspect the internal rubber seal under the cap and clean out any trapped mineral sediment during routine maintenance.
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