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Spa Calcium Increaser

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(You save $6.10 )
Bulk Pricing:

Below are the available bulk discount rates for each individual item when you purchase a certain amount

  • Buy 2 - 4 and pay only $5.71 each
  • Buy 5 - 7 and pay only $5.60 each
  • Buy 8 - 12 and pay only $5.48 each
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Spa Calcium Increaser for Hot tubs

  • Brings Calcium Hardness level to an ideal range
  • Reduces cloudy water caused by low calcium levels
  • 794 grams
  • Calcium Chloride 100%

Spa Calcium Increaser is used to raise the calcium hardness in spa water. Calcium hardness in spa water should be maintained between 150-250 ppm. Low hardness levels could caused the spa water to be corrosive which may result in damage to the spa surface or hot tub equipment. Lower levels also cause foaming caused by soft water.

Directions for use:
Read the entire label before using.
  1. Test spa water for Calcium Harness level 
  2. Compare test results to chart to determine the appropriate amount on spa calcium increase necessary to make adjustment.
  3. With the hot tub not in use and circulation pump operating add required amount directly into spa water. Continue circulating water a minimum of 30 minutes 
  4. Retest and adjust if necessary
Natural Chemistry's Spa Products are designed to simplify spa care and to quickly fix problems that arise and help reduce headaches so that you can enjoy soaking in your tub. Who would of known that in 1989 when the company was launched based on enzyme technology that they would become a leading player in the hot tub chemicals market. Natural Chemistry has grown to acquired SeaKlear and Aqualus to offer three strong brands in the specialty chemical market specifically designed to help all spa owners.


  • 5
    Great VALVE !

    Posted by Moshe Ronan on 30th Jan 2019

    Purchased 3 containers and saved money compared to local dealer. Best price online and fast shipping