Bromine pH question


Jan 1, 2020
Sonoma, CA
My question is the pH in my spa is always high requiring 1-2 oz of Sodium Bisulfate to adjust the pH down to 7.2-7.4 every time I test weekly or twice a week depending on bather load, (which does not seem to matter in regards to pH). Is this normal my thoughts are that the spa is always running a high pH so the water is in a high alkaline state, could this be corrosive to the spa. Alkalinity and hardness are in balance, bromine levels are 3-4ppm typically, I currently use HASA Brominating Tablets (1-Bromo-3-chloro-5, 5-dimethythydantoin) 96% tablets,
I was under the understanding that bromine will drive the pH down not up.

Thanks for any help


Mod Squad
LifeTime Supporter
Jan 17, 2012
Evans, Georgia
Spa pH tends to rise easily due to the aeration of the jets being used.

I find Muriatic Acid easier to obtain my desired results. I never used bromine so can't comment there, sorry!



Bronze Supporter
Jun 1, 2018
Hernando, Ms
I 2nd the use of muriatic acid- as the dry acid has sulphates which are not good for your heater.
What is your actual ta?
That has a major effect on ph in your spa.
There’s info in this sticky on adjusting ta
Most find it helpful to get ta to around 50


Jan 1, 2020
Sonoma, CA
Generally I keep the TA at 100, although now that I read the above it is to high Taylors book recommends 80-100 for hypoclorite etc and 100-120 for bromide so the TA is defiantly high.