pH is very high after adding baking soda


Nov 6, 2019
Sylvania, OH
Hello all,
My chemistry prior to adding baking soda were:
pH: 7.1-7.2.
TA: 40.
CYA: 40
FC: 6.

Two weeks ago I added soda ash to increase pH to 7.4 and it worked but today pH came back to 7.1-7.2. I thought this was likely due to low TA. I decided to increase TA to 50-60. I used Pool Math and recommended to added 2 lbs, 3 oz but I added only 2 lbs baking soda and waited 6 hours. I just retested pH and it is above 8 and TA is 50. Water is clear.
I thought baking soda does not affect pH much. So what happened here? Should I add muriatic acid or wait a day and retest again?

P.S. Did not SLAM recently.

Thank you.


Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
Laughlin, NV
Pool Size
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
The data does not add up. I would test again tomorrow.

Are you using trichlor to chlorinate?
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