Sometimes toilet plumbing can cause problems, especially involving water constantly running in the toilet tank after it’s been flushed. A tank that continues to run and either doesn’t or can’t fill up after being flushed is usually caused by a defective flapper, the rubber piece inside of a tank that plugs up the filling hole at the bottom of the tank. The flapper must be in good shape and undamaged so that it can fill up the hole and block further flow, so if it appears to be damaged or malfunctioning in any way, get it replaced.
A toilet tank that does allow water to run and fill up, but which allows water to continue running after being full is usually the fault of the float ball, a contraption attached to a small metal or plastic arm inside of the tank. The ball will rise with the increasing water level, and once it reaches a certain height, a valve is closed which stops more water from getting in. See if you can adjust the ball or arm by hand, or that its replaced if necessary.
Water can sometimes refill the bowl or tank in a slow or sluggish manner. The cause of this problem comes from clogs or blocked refill holes, which are very tiny holes seen under the rim of a toilet bowl. Use a toothpick or water stream to clear them. A clog in the drain of a toilet can cause water backup, and usually requires the use of a plunger to loosen or break up the clog. Make sure you know the number of a trusted local plumber to contact in case of more serious toilet emergencies.
