I have a sta-rite system 3 cartridge filter that is needing to be cleaned about once / week. Last Friday morning, I cleaned both cartridges with a hose. There was minimal heavy stuff (grass, dog hair etc... the dog doesn't swim in the pool but some blows in)... mostly kind of a bluish "dust". Of course, even after cleaning, there is the usual gunk between the pleats still, but pressure dropped to 9 PSI and went up to about 13 PSI within a few hours (as the cartridge got re-saturated with water?). The water has remained crystal clear since then and the only thing I've added is bleach and PolyQuat. However, I just checked and the pressure is now up to 18PSI again, so it will likely be 10 PSI higher than "clean" within a couple of days.
Does anyone have any idea what could cause this? There is a tree hanging over the pool, although at the moment it's not dropping a lot of garbage. The filter is 1 year old, but my pool turned black with the hurricane and again this spring with a heavy rain and was having to be cleaned 3-4 times per day for a while. Also when the tree drops pollen in the spring, it clogs up really fast. Is it possible that with all of the extra cleanings, it has worn out this fast?
It generally looks to be in good shape. one of the plastic bands was coming lose so I hot glued that back on and it has a rust stain near where the inlet pipe is.. other than that it looks pretty good, although I may not know what to look for in a worn out cartridge.