I began running a Hayward 13" AGP sand filter last year and it performed very well. This year, it is losing flow much, much earlier, with no change in load or pool care issues. When in need of backwash, the PG will indicate 5 PSI, and this has been the case since new. It is a small motor/filter setup, so Im not worried about that. What is an issue, is the very short run times. It seemed to be 10-12 days, and at least a few vac sessions between BW times. Now I get one vac at best, and or a few days run time before I lose flow.
Before I tear into it it, I wanted ask for opinions. Is this channeling, plugged lateral (slotted bulb in this case), something else? Any thoughts would be appreciated.