Hi, I'm getting Sand coming out of the return. I ordered a new lateral assembly. Does anyone know how those elbows remove from the bulkheads to get to the lateral assembly? There is zero info on You Tube or here on the S311SX Side Mount. The pool was installed in '10 and as far as I know, original sand. It looks like there are screws in the elbows, but really don't know, I didn't open it up yet. If I start to break things because they are probably brittle, I'll send back the assembly and just buy a new Pentair sand filter. I ordered 350lbs.of Mystic White II sand from Home Depot. Any help will be appreciated. Thanks