I have cared for pools (not professionally) for many years and have had sand or DE filters. I just bought a new house an inherited a cartridge filter (Sta-Rite 3). The pool was clean when I first bought the house. I had not moved in and didn't care for the pool properly and it went very green very quickly. It seems like I got the water chemistry correct now, but the pool is still a little green and very cloudy. I don't know how old the cartridges are and know they need to be replaced very 2-5 years. Is there a way to tell when they need to be replaced? It does not operate the way my other filters worked. The pressure starts off a 2 psi and goes to 10 pfiltsi. The filter never goes above 10 psi. At 2 psi the return water looked clean. At 10 psi the return water looked green (when vaccuuming up the algae).
My last pool had a DE filter and if the cartridges need to be replaced I am considering going to DE. I do not see any benefits to the cartridge filter. You don't need to backwash the filter, but you need to use fresh water to clean the cartridges. The cartridges also don't filter as fine of particles as the DE filter. Is there an advantages to the cartridges I am missing?
33,000 gal inground.