Re: Spas
Your TA level is way too high and your pH target is too low. A higher TA and lower pH result in faster carbon dioxide outgassing and that causes the pH to rise with no change in TA. Bromine tabs are net acidic so they lower both pH and TA. So in your case, you've got the bromine tabs lowering your TA and you've got so much carbon dioxide outgassing that the pH is rising in spite of using bromine tabs. The main factor in this is your TA. Get it down to no higher than 80 ppm and even that might still be too high if you've got lots of aeration (spa jets) of your water.
You don't need calcium in the water unless your spa is plaster or has tile with grout.
15.5'x32' rectangle 16K gal IG concrete pool; 12.5% chlorinating liquid by hand; Jandy CL340 cartridge filter; Pentair Intelliflo VF pump; 8hrs; Taylor K-2006 and TFTestkits TF-100; utility water; summer: automatic; winter: automatic; ; PF:7.5
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