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I changed all the laterals. No more sand under pump filter basket. Still have dirt. though. however..... mine does "poof up" when I try to vac it out. my FC is never below 3 and zero CC everyday, and water crystal clear. since im about to transfer this water to new pool maybe I should SLAM it just to be on the safe side...

duraleigh, wouldnt dead algae stay in sandfilter once you vac it out? obviously its not multiplying if its dead.... at least thats my thought. if it is dead algae, does chlorine eat it up by slamming or will it have to be vac'd and slammed?