Glass 1989 SPA Manual De Uso página 79

NOTE:
After administering a super chlorination treatment or non-chlorine shock to your spa,
leave the cover open for a minimum of 20 minutes to allow the oxidizer gas to vent.
A high concentration of trapped oxidizer gas which may exist as a result of the shock
treatment (not daily sanitation) may eventually cause discoloration or vinyl degradation
to the bottom of the cover. This type of damage is considered chemical abuse and is
not covered under the terms of the limited warranty.
THE SPA WATER MAINTENANCE PROGRAM
Each step in your water maintenance program is dependent on the completion of the
spa and its components, as well as cause discomfort for the user.
A. The recommended Total Alkalinity (TA) for your spa water is 125-150 ppm.
B. Total Alkalinity is a measure of the total levels of carbonates, bicarbonates, hydroxides,
and other alkaline substances in the water. TA is referred to as the water's "pH buffer".
In other words, it's a measure of the ability of the water to resist changes in pH level.
pH can cause corrosion or scaling of the spa components. Low TA can be corrected
to bring down. It can be lowered by using sodium bisulfate (pH/Alkalinity Down).
When the Total Alkalinity is within the recommended range, proceed to the next step.
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 inhibitor
should be added to the spa water, according to label instructions.
D. If the CH is too low add CH Increaser.
water with a high or low calcium content will raise or lower the CH reading of the water.
step.
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