The float valve: guardian of the full level
The float closes the incoming water when the level reaches a set point. If it sticks or corrodes, the tank can overflow, damaging surfaces and wasting water, or it may not fill as it should, affecting pressure and supply.
During cleaning check that it moves freely, that the arm and ball are intact and the valve seat is sound, and watch for scale or rust. If it works stiffly, replacing it costs less than the consequences of failure.
Adjust the shut-off level so a safe gap remains below the top opening and the overflow level. Do not rely only on looking at it; move it by hand and check that it closes tightly.
