Filled the spa yesterday and tested the water before adding sanitizer. My TA was 280! I think pH was about 7.3; CH about 300. Can I use dry acid to lower alk in the same way one uses muriatic in a pool, or does that not work?
This morning my pH was on the high side, say 7.7. But the water was quite warm, and I read later this morning that temperature affects the pH test. Should I let a sample cool to room temp and then test the pH?
OOOOhhh! It just occurred to me that since I shocked last night, the bromine level was probably still pretty high. I know high chlorine levels interfere with the pH test--does high bromine do the same thing??
Since I'm using bromine which is rather acidic, that is purported to "eat" alkalinity. . . perhaps I should just monitor the alk and see if the bromine brings it down??