Need to replace 6 year old cartridges in a Pentair C&C Plus 240 filter but am considering upsizing to 320 cartridges. I'm not sure its cost effective if the only benefit is less frequent cleaning. I have a 16x32 salt water pool that holds approximately 20k gallons of water with one skimmer. Chemicals are balanced but pool vacuum can't keep up with dirt and minimal tree debris. The pool is surrounded by crops that likely add to the debris. Neighbors with similar pools swear by their Pentair DE filters. Not wanting to deal with DE after years with an above ground but am curious if anyone has any experience with the Quad D.E. Cartridge Style filter. I'm also wondering if one skimmer is the problem and if so, what can be done at this point?