Would have called just now, but no fone in your user profile.

Still just sounds like massive dead floating algae, and the typical problems that result when you try to clean that up with a really typical, really poor, AG pool filter setup. In general, AG pool sand filter and pump combos are TERRIBLE at cleanup.

There is another issue. I don't know which clarifier you used, but overdoses can make smaller particles essentially un-filterable. Add up your TOTAL clarifier use over the last week and compare it to the maximum dose on the bottle. If you are over, or close, that's probably a contributing factor.

HOWEVER, it sounds like you ARE filtering if you use DE or the cartridge.

If you are willing to wait another week, turn your filter on high, leave the cartridge in (get a new one if you can) and filter away. Do NOT add more clarifier. DO keep the chlorine high, to kill any remaining algae and to break down (hopefully) any excess clarifier.

If you want a clear pool sooner, go get a new DE filter or drain and refill. In fact, with just 6200 gallons, it would be cheaper to drain and refill.

Best wishes.

Ben

PS. Just had a thought -- is the sand in your filter LABELED filter sand? Some dealers have sold coarse sandblast sand as a high margin substitute. If so, you need to replace the sand you have with real filter sand. Doing so won't affect anything with the cartridge in place, but long term, it will.