Why does my toilet tank fill up when I flush?
Why does my toilet tank fill up when I flush? Over time, hard water creates mineral deposits that harden and accumulate along the ports, causing obstruction and hindering toilet water to flow freely. Low water level in the toilet tank. The water in the toilet tank should always be high enough to give a powerful flush. What should I do if my toilet tank is not filling? For newer toilets, turn the fill valve adjustment knob with your hand to let more water into the tank. For all toilets, make sure the water level is about an inch below the...