I just reopened my hot tub, the guy I sold it to has not came for it and it has been sort of empty for around two weeks. I did not want it getting nasty so I reopened it. I have it on the BBB method and it does not take much to do something drastic to it. I have gone the extreme on the PH each direction a few times now. And I figured that the bleach would not take alot so I have been careful with it.

As for the PH though, I tested the TA and it is around 50, I need to get that up and I am sure the PH will be a bit more stable. I believe Baking Soda will do that, I am going to mess with that tomorrow after work. I have been using Borax and Muratic Acid to go either way, and the Borax does not raise the TA, so I will substitute it for Baking Soda.

I think the hot tub is a neat little test area, great for quickly seeing results and showing you respect for the quantity of the chemicals you use and its effect on things.