I am trying to get a 13,000 gallon in ground pool cleared up. It has not been clear in about two years. It has been shocked a couple times during that time but never cleared up. It has a pentair quad de 60 filter and jets in the bottom of the pool for returns. It is mostly blue but really cloudy. I have taken the filter apart and cleaned it multiple times and the pressure starts off good and ends up at 30 with very little water flow. I figure this is just because the water is so bad. Is there any way to run a regular cartridge in this filter so it takes longer to clog up. Or would I be able to use flock if I took the filter cartridges out and run the system without them in order to circulate the water. I am trying to figure out a way to clear the water up without having to clean the filter and put more de in every hour.