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Hi all,My city water that I use to fill my spa has a pH of 7.5 which is what I want, but TA is very low coming in at 25ppm. If I try to raise the TA where I would like it around 80ppm it will throw the pH out of wack going way high. In the past I have tried lowering the pH with bisulfate then bringing the TA up using bicarbonate. Should I not worry about low TA if my pH is in range? I was hoping someone on here has maybe gone through this and has some insight. Thanks in advance!

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  • 2 weeks later...

Why are you setting your pH so low? The natural tendency of a hot tub is for the pH to rise because of outgassing of CO2.

get your TA in the 50 to 70 ppm range and let your rise above 7.8 before lowering it. Don't lower it below 7.6 or it will rise faster than if you set it higher.

These threads will explain what is going on:



IMPORTANT!!! How are you testing. If you are trying to balance the water with strips they do not have the resolution needed for adjusting TA. You need a GOOD drop based kit such as a Taylor Technologies K-2006 (chlorine) or K-2106 (bromine)


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