Yeah I have pool math. And I thought I already connected it. I have that enabledLet's call it muratic. pH minus is a pool store name for sodium bisulfate (dry acid) which you should not use.
Ok, great. Do you have pool math? Link-->PoolMath
If so, make sure you logged into Pmath with the same login as TFP. Home screen click on gear in upper right. Scroll to the bottom and enable sharing with TFP.
Then we can see your chemical results and your additions.