I moved to Fl last year and this is my first year of having a year round pool. I have always owned a vinyl liner pool with a sand filter and have done my own maintenance. This is my first time owning a concrete pool with cartridge filter and I'm at a bit of a loss. Pool went green practically overnight and nothing I seem to do helps. I have added probably 20+ gallons of liquid chlorine, 15# of shock and several bottles of algaecide over the past week and nothing seems to help. My chemistry is all showing within normal range. Vacuuming doesn't really seem to do much as it all seems to be in the water. I am having to change filters daily if not more. Within about an hour after startup the pressure on my filter goes from about 10psi to over 30.I have had problems keeping the cartridges clean since we first moved in. With a sand filter I could backwash but the cartridges seem extremely difficult to operate properly.I am running out of both money and patience. Suggestions would be greatly appreciated. Thank you!