Prior to add Borax: I think I lowered the AL too much (40ppm) from 90. Here is how I did it: After chlorinated the pool to 6 ppm FC, brushed and vacuumed the pool to waste, tested the water last evening, FC 6.0 PH 7.5, TA 90, CYA 40, TH 230. Pump ran all night. Shut it off wait a our, dumped a...