Every now and then dirty, black water backs up from my shower drain and sits still for a few hours and then drains back out, the toilet in the same bathroom also sometimes has no water in the bowl.
Yesterday the sink in my other bathroom was clogged and I tried Drano but the water did not even move. This morning I noticed the shower in the other bathroom backed up again with dirty, standing water. Are these problems related? I am going to call a plumber but wanted to know if this is serious.
Thanks for your help!