Very Low TA, Low pH


In The Industry
Nov 12, 2019
Grand Marais, MN
Yes, both TA and pH tend to be low at the end of the day in our hot tub. The TA can be very low, i.e., in the teens sometime, while the pH tends to be test kit low but sensor tolerable (not sure why the discrepancy, either). Our rep said we might up our pH set point to 7.6. Still, adding NaHCO3 every day seems like a band-aid solution. What could be wrong? I just took over maintenance at our local Y pool and don't know much yet. A wild guess is we're putting too much acid in. . . . We have BECSys5 input/sensors.


Gold Supporter
TFP Guide
Jul 21, 2013
Northern NJ
Welcome to TFP.

.A wild guess is we're putting too much acid in.
That sounds like a pretty good guess.

Confirm that you are asking about a public pool/spa? You have regulations that don't apply to residential pools and spas that this forum focuses on.

Can you give more details about the body of water you asking about. Gallons? Size? Temperature? Water chemistry?