Hi,
I install alot of cartrige filters on pools and I find that with a clean filter my pressure is about 2-5 psi thats the great thing about a cartridge filter low backpressure. You can also check the pump impeller thats the only other place that will reduce pressure. When you bleed the air does it spray alot of water? Hows the pool water clarity? Hope this helps
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Thomas Esarey West Lake Pools
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