My Toilet's Fill Valve Is Slow

Written by christopher john
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After a toilet is flushed, water rushes out of the tank and into the bowl below. A fill valve that is slow to refill the tank is an annoyance, especially when a bathroom receives heavy use.

Proper Fill Valve Function

The job of a toilet's fill valve is to allow a predetermined level of water into the tank before shutting off. The fill valve is a component of the tank's flushing system. It works in connection with the flush valve, which opens to allow water into the bowl, and the overflow tube, which accepts additional water from the fill valve to flow into the bowl.


Turn the water shutoff valve counterclockwise, increasing the water pressure into the tank. Also check for and remove any kinks in the supply tube. Remove and flush the supply tube to get rid of any blockage. Also, cleaning the valve inlet or valve head may remove any debris blocking the water flow. Replace the fill valve if it continues to sluggishly fill the tank.


A slow-filling fill valve takes an extended period to refill the tank before properly shutting off until the toilet is flushed again. This differs from a fill valve which stops then starts refilling the tank again. These two situations involve performing different repairs, so pay attention to how the fill valve is performing.

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