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Yes, the o-ring is as you have described and is lubed. We have a new O-ring on our shopping list for the next disassembly, even though it appears in good condition. I was surprised that there wasn't a tighter "sealed" fit where the grids meet the manifold. But it's hard to see exactly how far...

Yes, we did check the BW valve. We didn't see cellulose returning to the pool. We did recheck the grid installation this morning as well carefully go over the manifold. The directions for tightening said to be snug but not overtighten - it seemed to match that description. Maybe we just need to...

We recently had a large algae bloom in our pool. We shocked it and ran the filter for three days straight. The pressure went up normally at first but then stopped increasing after backwash. We took apart the filter and checked the grids, which are the original ones from the filter install in...