Asked on Mar 14, 2012
Is there really supposed to be standing water in a p trap?
I am asking this specifically regarding my upstairs shower, which always has about 2 inches of standing water in the drain. It drains, except for one day when it backed up a little bit. My local Home Depot guy recommended that I treat it with something similar to Drano, but after two treatments, it still has standing water. Another trip to HD and a different guy later, I am told that there should always be some water in the P trap. Can anyone tell me about this?