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ok so i shocked my 60,000 indoor pool 3 days ago....to 20 ppm....today still 5+ ppm on my test .....why does it take soooooo long for my chlorine to drop to a safe level?

good evening, ok first off i have a indoor pool with aprox 60750 gal, with a salt level of 2500-2800 (depending if you look at a test strip or the digital readout on the board) for the last few weeks i have been fighting my chlorine levels unable to keep them between 2-3ppm. they were way too...