Alkalinity; Calcium Hardness - Sunrise spas Classic Collection Series Owner's Manual

Alkalinity

Total alkalinity is a measure of the alkaline in the water. They act as a pH buffer or a pH stabilizer preventing large
changes in the pH. The total alkalinity should be between 80 to 150 ppm; ideally 120 ppm. Tablet chlorine and
bromine tend to gradually lower the alkalinity level.
Low total alkalinity causes:
•
the pH to wander
•
corrosive water
•
disinfectants to be ineffective
To raise the total alkalinity, add ALKA RISE.
High total alkalinity causes:
•
cloudy water
•
scale formation
To lower the total alkalinity, add a pH Reducer.

Calcium Hardness

Calcium hardness is the hardness present due to dissolved calcium. The desired range is 150 ppm to 280 ppm.
Low calcium hardness causes:
•
corrosive water
•
staining of spa
To correct this problem, add a Scale Preventative. (Do not fill the spa with soft water!)
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DOC: OM-SUNRISE-18E
European Sunrise Spas 2018 Owner's Manual