Watkins Solana, Owner'S Manual

Page: 43 / 63

B
ALANCING THE
C
ALCIUM
H
ARDNESS
(CH)
A. The recommended Calcium Hardness (CH) level for your spa is 150-200 ppm.
B. Calcium Hardness is a measure of the total amount of dissolved calcium in the water. Calcium helps control the corrosive nature of
the spa’s water. That’s why calcium-low water (commonly known as “soft” water) is not recommended. It is very corrosive to the
equipment, and can cause staining of the spa shell.
C. If the CH is too high (commonly known as “hard water”), formation of scale on the spa’s shell surface and equipment can result.
CH can be decreased by dilution–a mixture of 75% hard and 25% soft water will usually yield a reading within the correct range.
If soft water is not available or practical for you, a stain and scale control should be added to the spa water, according to instructions
on its label.
D. Once the CH is balanced, it normally remains stable, although the addition of more water with a high or low calcium content will
raise or lower the CH reading of the water.
E. When the Calcium Hardness is within the recommended range, proceed to the next step.
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