So I have a situation that I am preparing for and am using PoolMath to crunch some numbers but I just want to confirm first. By the way, this is not my pool in my signature.
10,000 gallon pool that I am currently SLAMMING, hope to finish tonight. Before the SLAM, PH was 7.2. CYA is 35. According to PoolMath, when I am done with the SLAM of course, I need to add 60 oz. of stabilizer to bring the CYA up to 80 (It's a SWG pool). Also according to PoolMath, that will lower my PH by 0.8, which would make my PH 6.4. I would then need to add 148 oz. of Borax to get it back to 7.2
That seems like an awful lot of Borax. Is it possible that the CYA will not actually lower the PH that much? 6.4 is awfully acidic. So my basic question is: Do I trust PoolMath and add exactly these amounts? Or should I add the CYA, retest PH, and go from there?