Status Update: The water is almost totally clear but the grids still only go about three hours then I backwash and they need another three hours. Then backwash. I did the TSP soak overnight. Then the acid soak overnight. Vacumed to waste. Current test results:

TC 3
FC 3
PH 7.6
TA 109
CYA 36


20k gallon 16x32


Any other suggestions? Maybe time for new grids (they look fine)? The suction and return lines are fine because the pressue is even when on recirculate.

Help!! I'm selling this house in two weeks and don't want to spend too much more money for a pool I'm not going to enjoy.