I just put in a laundry sink and filled it up with water to see if it would hold. It passed the test, and I decided to drain it. I took the plug out and the water started draining. All of a sudden the floor drain had water coming up on to my tile. Is it just a clogged drain, or perhaps the pipes I used for plumbing (1 1/2" pvc) aren't capable to handle the amount of water???