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After a disastrous "pool guy" nearly destroyed our pool and we brought it back from being a bio hazard (well maybe not that bad...lol), I've been trying to get the brown stains off. And they're a lot better but still some left. Used Stain Free last year and the top steps were very white, 3rd...

My CYA is way too high and I know that. I've gone to all liquid chlorine, muriatic acid, etc. using Taylor testing. Today my ph was at 8 and my TA (appropriately factored for CYA was 109. Added the pool math suggestion to lower PH...tested 2 hours later...PH is now 7.5 but my TA shot up to 122...

For instance, regarding alkalinity, Bioguard recommends between 125-150, Hach strips 80-120, Taylor 80-120 and TFP says 60-80. 23,000 gal plaster pool, 18 yrs old. I just took over its care aft3r our last pool guy went nuts and abt destroyed it. Now it's crystal clear and most of the stains are...