I've been having trouble with pressure building up in my DE filter. The waterfall from the hot tub just trickles into the pool. The hayward pool vac xl just barely creeps across the bottom. I have a friend with a pool business and he suggested I remove the cartridge all together to see how the pool runs. When I did this the pool vac blasted across the pool bottom and the waterfall was like Niagara. He thinks that I need to replace the inner plumbing (the grids) for the filter, since once they were removed, everything worked fine. I mean, its to the point where I will spray the whole filter out, remove all the old DE, and then replace with new DE. Within 2-3 days, the pool is barely functioning. . .the trickling waterfall and slow pool vac will be in full effect. My friend recommends just going to a standard cartridge filter (NO DE) and says that I can convert my Pentair Warrior DE filter to handle a standard cartridge and ditch the DE. I've been looking for a second opinion on line about this conversion, but I can't find anything. I've called my local pool store chain (leslie pools) and they said they've never heard of converting a DE filter to a standard cartridge without removing the whole thing. Anyone have any thoughts or suggestions. I could replace the guts of my DE filter with the same DE parts for just under $200, and according to my friend, could buy all the parts to convert it to standard non-DE cartridge for roughly the same (like $180). Any help would be appreciated.