62. Water Chemistry Abbreviations/Acronyms & Ranges - Arctic Spas
ABBREVIATION/ACRONYMS DEFINITION CORRECT CHEMICAL LEVELS
CH – Calcium Hardness – 50 – 150 ppm
TA – Total Alkalinity – 80-100 ppm
pH – Potential Hydrogen – 7.2 – 7.6 ppm
ORP – Oxidation–Reduction Potential – 545 – 550 mV Spaboy Optimum Range. (Optimum Range is the default factory setting, user may adjust higher if preferred).
Depending on the water chemistry which will be effected by bather load and spa usage, at times the ORP value will overshoot or undershoot the Optimum Range.

1.12 Water Chemistry Abbreviations/Acronyms & Ranges