Bought a house with a pool, last year we replaced the liner, as the former owner of the house stated that it was replaced 10 years ago, but the contractor said that the liner was close to 20+ years. This year the pump appears to be causing the issue. I was attempting to vaccum the pool for the first time, and noticed that the moment I attached the hose, I was getting air in the line. Isolated the problem to the union elbow, (spx1485b3), the coupling and sight pipe on the elbow was probably as old as the pool, and the o-ring was causing some water to leak and air to enter.
I opened the packaging, tossed on some nylon tape to the threads and attached it to the top of the pump. I tightened the coupling down with large pipe wrenches, to the point where I am afraid to tighten any further as I may damage the pump. However it is still leaking, actually more now. See the pic below.
question to you, is there an o-ring where the union and the top of the housing meets? Do I need to even tighten the union further? do i need to take it off and add the nylon thread better?
The leak is small enough to filter the pool, but I cannot use it to vaccum or clean.