Re MA: check the MSDS; it's likely that will reveal whether there are problematic additives. However, the presence of even the slightest 'sudsing' or soapy bubbles in the MA solution is sufficient reason to keep it away -- far away -- from your pool.
I wouldn't worry about the TA. Just add the borax, and then add MA till your pH is normal. If you have a K2006, you can use the acid demand test to quantify how much MA is needed at any given point. However, I think the "poolcalculator.com" will also give you a useful indication. I would STRONGLY recommend that you (a) use PLAIN 31% MA and (b) never use more than 1/2 of the dose you think you need to fully correct. You can always add more later.
If you haven't already, do read the MA safe handling guide => http://pool9.net/ma/
Bookmarks