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What is TA ? Total Alacanity?

My PH is below 6.8, i already add 1.5 pound of PH + without any result... My Chlorine is level is none.

Hi, my pool have a very low PH, i add PH + 3 times and still the same result, i bring a water sample to the pool store and the guy recommend to drain the pool and refill, did someone know what to do except the drain solution, hi have a well and it will takes 2 weeks to refill.