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Slowly pour 12.5 pounds of DE in the water while precoat valve is open. This is a 10 year old pool.

Pool pump Pit

Pool filter

Yes an unpressurized tank. It has a hinged lid to keep debris out and to clean. Tried to add a pic but said it was invalid?

Thanks all and thanks for the welcome. On my 1800 gallon Spa I clean the Hayward C2025 filter cartridge when pressure rises 10 PSI over clean. It has a pressure dial with green and red pointers spaced 10 PSI apart. Runs at 10 PSI clean and 20 PSI I clean the filters. More interested in the pool...

I just started working taking care of a commercial pool and spa. I want to know how often or when to clean my DE filter grids. They are in a tank on the suction side of the pump. I mounted pressure and vacuum gauges for the system. When filters are clean the pressure reads 18 PSI and the vacuum...