my TA is 220, yet PH 7.4, FC 4, CYA is high 120, CH 230, 10k gallon in ground fiberglass pool, had been use BBB method for past few months, and I used cholrine granules 3 times in past 2 months as FC levels dropped below 1.5, 2-3 oz at a time just to spike it back up, unusal warmer weather...