Is it normal to be needing to cleaning cartridge filter every 30 minutes? After about 30 minutes the water out flow is low. Clean the filter and it runs fine. I know for sure there is no clog in the pipes. I took the filter out ran it for 2 hours and had no problems. Pool was a swampy green (wasn't put up in 2018). Water is balanced and I shocked it with 8 pounds of shock. It's very cloudy can hardly see 6 inches deep. Should I just keep cleaning filter until it starts clearing up?