I had found DE in my pool. Had the tech come in. He first replaced the filter manifold and three or four grids. The problem still persisted. So, he reportedly changed some more grids. I am still seeing DE in pool. The screen at Polaris inlet gets clogged with DE and small trash very quickly. I backwashed the DE filter thinking it may have too much DE and then had the Polaris disconnected. Ran the pump(s). A lot of DE was visibly coming out of the Polaris inlet. I have also notices that at least two return into my pool spa have almost no water flow.
1. Assuming that the tech fixed everything in the DE filter. What else be wrong? Or did he just miss some tears/ holes in some of the grids?
2. Can the backwash valve be the problem? Why would DE come out to pool and from the Polaris water inlet especially after backwashing the DE filter?
3. What could be wrong with the spa returns.
Any advise is welcome.