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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...