I finally got around to replacing my filter and pump today. I have a 20,000 gallon in-ground pool/spa setup that previously had a 2 hp whisperflo pump for the pool and a 2 hp whisperflo pump for the spa. My old filter was a 60 sf de (Pentair variety). The operating pressure typically stayed at roughly 20 lb.
Replaced the 60 sf de with a Sta-Rite modular plde filter that is 48 sf (the filter element is a cartridge) . Per Jason's advice on downsizing the hp on the new pump, I bought a full rated 3/4 hp (Sta-Rite Max E Pro). The spa pump did not need replacing. Anyway, everything seems to be fine but my operating pressure has been reduced to roughly 5 lb. I have never had pressure that low so I am wondering is this typical given the reduction in hp? Also, does this mean I need to run my pump for 12-16 hours per day versus 8-10 that I use to run it?
Thanks in advance for your input!