DE leaking into pool and have high pressure?

Question

I'm not sure what is next. I have DE leaking into my pool and the pressure has slowly risen for the past month. It was around 17-19 PSI when I opened the pool over a month ago. I found a crack in the top manifold so I replaced it thinking that was the problem. I also replaced all the grids because they were old. I inherited the pool when I bought my home about two months ago. I think my problems are solved, but they aren't. I still have high pressure about 24 PSI now. Even replaced the gauge with a new one. DE leaks into the pool when I vacum, and it's alot. The skimmer has little swirling action and the two returns are not pushing out the water like they once were prior to this problem. I can hardly fill my vacum hose to and get little suction to vacum the pool. No air leaks that I can find and even replaced one of the o-rings inside the filter. It seems I have a blockage in the return lines. I guess I need to call for service unless someone knows how to check for blockages?

Answer 1

sounds like you may have a problem in the backwash valve that could cause high pressure and leaking D.E. is it a multiport valve?....