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SeaKlear Spa Calcium Increaser is ideal for boosting calcium hardness levels in your spa or hot tub, preventing corrosion damage to equipment and etching in plaster surfaces. Its easy-to-use liquid formula can be added directly to spa water without dilution or mixing, and is compatible with all major sanitizer systems. Best of all, Spa Calcium Increaser is made to the exacting standards SeaKlear demands of all its products, allowing you to buy with confidence.
1 fl oz per 500 gallons of water to increase hardness by 7 ppm.
- Determine the amount of product to be added using a calcium hardness test kit.
- Pour the proper amount of the product into the spa or hot tub with equipment turned on.
- Run the filter for 1 to 2 hours.
- Water may be retested in 20 minutes.