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Increase spa calcium hardness level or hot tub calcium hardness levels to prevent corrosion of fittings and equipment. Spa Calcium Increaser spa chemical is essential to a safe and clean spa.
$6.99
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Here are other products you may be interested in.
Clear cloudy spa or cloudy hot tub water with highly effective In The Swim Spa Clarifier. Spa chemicals and hot tub supplies from In The Swim, including spa covers and replacement filter cartridges.
A unique pH balancing chemical that adjusts the spa pH level to the ideal range of 7.2 and 7.8. Prevents pH drift,eliminates need to adjust pH on an ongoing basis. One quart treats up to 500 gallons.
Fast-dissolving granular non-chlorine shock treatment works instantly,only minutes of spa down time! Rids water of residual soaps, deodorants, natural oils and organic materials that can build up.
Powerful non-chlorine, liquid shock formulated to break down oils, lotions and other organic materials. Designed for use with Leisure Time Free. Contains 7.5% hydrogen peroxide.
Quality fragrances are non-oily & non-foaming & leave no residue. Does not affect water balance,is safe on equipment & surfaces, compatible with chlorine, bromine, ozone and biguanide sanitizers.
Use Spa Cleaner on the acrylic shell of your spa or hot tub. Spa cleaner and hot tub cleaner is available in several different quantities. Spa supplies and replacement spa filters from In The Swim.
Low foaming formula quickly clears the inside of spa plumbing of buildup; organics, oils, dirt and minerals. Use each draining and refilling cycle.Compatible with all spas, hot tubs and jetted tubs.
Powerful non-chlorine spa shock and hot tub shocking chemical is specially formulated for use in spas and hot tubs. Spa chemicals and hot tub chemicals from In The Swim are safe and effective.
Fast-dissolving granular non-chlorine shock treatment works instantly,only minutes of spa down time! Rids water of residual soaps, deodorants, natural oils and organic materials that can build up.

