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Right, for this reason I currently have 50ppm borates in my spa from Borax which I monitor with test strips. I did have more success with a 50ppm TA than with 100+ppm but that's pretty far off most recommendations. 100-120ppm is a fairly common recommended range. What do you make of this...

I can't seem to stop the air bubbles completely, but I may be able to reduce the number of times the cycle runs. That's a huge difference. I didn't think that 1 minute * 4 times a day would bring up the pH that much. Is "too high" and "too low" absolute or is it relative to other factors? pH...

Targets: Bromine 4ppm, pH 7.5, TA 100ppm, CH 170ppm, Borate 50ppm, Temp 100F Using: bromine tablet floater, dry acid, calcium chloride, borax, bleach. The hot tub has an ozone unit, but I'm not convinced it works. It's very old and the tubing looks sealed at the kinks. Tests: Taylor drop kit...