My small water tank is overflowing and dripping out of the overflow pipe in the alley outside. I'm not very good with plumbing problems but I looked inside the tank and it was full of sludge, which i thought would be the problem. I emptied the tank and allowed the ball cock to fill it with clean water. It was working fine but just went to see tank and it I'd half way over overflow pipe, much higher than before. Why is there more water coming in than being pumped out? I have a metal armed ball cock. Not sure if it needs replacing or how to do it? Any help please.
Lee
Lee