Hi all. I have a 30 foot round AG pool with a StaRite cartridge filter. I have always had problems keeping the cartridge clean and I replaced it about 4 weeks ago. I had an algae breakout 2 weeks ago so the cartridge had alot of work to do. The pool has cleared up, water is nice and clear and test results are good. Problem I have is that I have to take the cartridge out everyday and hose it down....or my pressure gets to high and it doesn't let water thru. I do have some pine needles on the floor of the pool since my property is surrounded by pine trees. I typically have had to replace the cartridge once a year at $180.00 per. Pool Store sold me a spray on cleaner which I tried and still got only 24 hours out of the cartridge. Have also tried dish liquid overnight soaking. Any suggestions ? I am considering switching to a sand filter, can someone recommend one....? This is a 20,000 gallon pool.