Re: Correct TA for pebblesheen
It's not just that. Even the NSPF CPO courses talk about 80-100 ppm TA when using hypochlorite sources of chlorine and 100-120 ppm when using acidic sources such as Trichlor. Historically, there has been a lack of understanding of how much TA affects carbon dioxide outgassing and a mistaken belief that because the pH of chlorinating liquid and bleach is so high that this must be what makes the pH rise -- that is, many people didn't account for the fact that chlorine consumption/usage is acidic. Yes, this is very lame, but is pretty typical of the pool/spa industry where somebody somewhere gets something wrong and everyone else repeats it like lemmings. Unfortunately, some of this stuff gets baked into some state/county codes and then the commercial/public pool folks end up spending way more in acid then they need to because they are forced to maintain a minimum 80 ppm.