I currently have a Pentair CC200 filter and thinking of upgrading to the 420. What should I look for a higher filtration rate or GPM. My max pool volume is 24K, plaster pool. I'm slamming the pool to get it clean and not sure that CC200 is turning water. The pressure ranges around 20PSI.. I've cleaned the filter every averaging 4 times a day for the last 2 weeks. I've soaked it twice in TSP as well as placed in acid wash. When I turn on pump the PSI will start between 8-10 and within 5 mins jump to 20. THe max it has gotten to is 25 PSI.... Help, is there something I am doing wrong or should I look at a different pump. My chemicals are okay and maintaining FC levels.
CC200 Filtration Rate 200, GPM 200
420 Filtration rate 420, GPM 150