: Have a new home…3yrs. old..Kohler fixtures. Recently noticed toilet fillers have really slowed down… water pressure in rest of house is fine. ????? sounds like sediment in your flush valves-turn off water under/behind toilet, dismantle flush valve, crack open valve behind toilet to flush out sediment in the tanks flush valve (you can hold a cup over the valve so it doesnt spray you, then turn water back off and reassemble flush valve-sound confusing? call a licensed plumber