Natural Chemistry

Natural Chemistry Spa Calcium Increaser 1.83Ib.

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  • Regular price $15.99
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Natural Chemistry’s Spa Calcium Increaser is used to raise calcium hardness in spa water. Calcium hardness in spa water should be maintained between 150-250 ppm. Low calcium hardness levels could cause the spa water to be corrosive which may result in damage to the spa surface or equipment.


  1. Test spa water for calcium hardness level
  2. Compare test results to the chart below to determine the appropriate amount of product necessary to adjust.
  3. With the spa circulating pump at high speed, add the required amount directly into the spa water. Continue circulating water for a minimum of 20 minutes. Do not pre-dissolve this treatment as heat is generated when it contacts water.
  4. Retest and adjust if necessary.

 Spa Volume     20ppm     40ppm    80ppm     100ppm

200gal              .75            1.5           3              3.75

400gal              1.75          3              6              7.5

800gal              3              6              12             15