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Thanks Chemgeek, I really appreciate taking the time to point me in the right direction. To answer your questions, the hot tub is 420 gallons and honestly the reason I added Baking soda was because the PH was low and I had some readily available. The last time I added baking soda I also saw the PH rise so this was kind of a scientific experiment. You are correct that it should have only increased the TA by 20(I transferred that wrong) which is why I'm so confused. I weighed it out using a scale and perhaps that's what I need to look further into. Sounds like my scale may be crazy inaccurate.

Thanks waterbear! I agree it's a little high. I used the Pool calculator referenced in Nitro's post and it said the baking soda of 2 oz should only make an increase of roughly .1 PH and 40 TA or so. Should baking soda be making that kind of a PH jump? I'm using the dichlor bleach method

I must be missing something. From everything I've read, Baking soda should increase the PH slightly and the TA significantly. The last couple of times I've added Baking Soda, my PH has shot way up. This morning my PH was at 7.2 and TA was at 60. I added 2 oz of Baking Soda and checked 2 hours later. The PH was at 7.8 and the TA was at 130. I use a Taylor kit for testing. What am I missing? Do I need to wait a full 24 hours to test again? I did run the jets for a few minutes and the circ pump ran for at least one of those hours. Thanks!

Thanks, that's actually the first thing I did, but it's still set at midnight for 7 hours. Even checked the clock to make sure I didn't have a dumb am/pm thing going. Thing is, I don't think it's running all the time, just some of the time

This one is driving me nuts and I can't seem to find any information about it through searching. Looks like a couple other people have run into it, but no one received a response. My 2012 Optima is set for standard filtration and is set to run from midnight to 7AM. I have the temp set at 101. Periodically throughout the day I will hear the circ pump running outside of the normal filtration window. My assumption was the heater was running, but since it's in the mid 80's here I became concerned the heater was running so frequently. Turns out, it's not running, but the circ pump is running. Why would it be running outside the filtration window if it's not heating? Last night when I got in the tub at 9:30 the clear ray indicator was on. I got in and checked the heater to make sure it wasn't running. Enjoyed the tub for 20 minutes and turned the pumps back off. The circ pump was still on and now with no indicator light whatsoever. There didn't seem to be any way to turn it off. I know it's not a huge deal, but I'd like to understand what it's doing Thanks!

Great, thank you for the response!

How long should I leave the cover off the hot tub after a chlorine shock? Thanks!