Hoping to post my lesson so others won't make my same mistake.. I am in Atlanta and have a lot of tree cover ( not my tree's or I would change that ) and get a ton of stuff year round. I wanted to replace my old sand filter and researched and bought the Hayward c17502..Single large filter that on paper was more then big enough for my 20K pool..After 5 years of having to clean it every week or 2 and having to buy new filters ( amazon is great) I decided to upgrade to the 4 filter c4030 )..So far we are getting hammered with hardwood junk and yellow pollen and the pressure hasn't changed I did open it and clean yesterday just to see and the filters were yellow.
My lesson is pick a filter that fits your area, the 17502 would have been great for a larger pool with no tree's..I hated to trash it and start over but after spending $130 a year on 2 filters I am hoping the return pays off!
Also shop around, I bought mine from a pool store on ebay and saved at least $350 vs the local pool store and got it in 2 days.