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SpaGuard Calcium Hardness Increaser

SKU: 42636BIO

In stock

SpaGuard Calcium Hardness Increaser


SpaGuard Calcium Hardness Increaser is used to increase spa water hardness. Spa water containing low levels of calcium will etch plaster and corrode equipment. Low calcium levels will also cause spa or hot tub water to foam. Maintaining a hardness level will help protect your spa from these harmful effects. 

What’s in the box

  • 1 x SpaGuard Calcium Hardness Increaser - 12oz


  1. Clean your spas surfaces, back-flush and clean filters.
  2. Test spa water. 
  3. Add appropriate amount of Calcium Hardness Increaser.
  4. 1 oz per 500 gallons of water will raise calcium hardness 7ppm

Weekly Maintenance 

  1. Using spa test strips, test your spas water and adjust when needed.
  2. Ideal Range for alkalinity level: 80 - 120 ppm.
  3. Ideal Range for pH level: 7.2 - 7.8.
  4. Ideal Range for Calcium Hardness: 150 - 400 ppm.

    Recommend For

    • Compatible with chlorine, bromine, ozone and biguanide sanitizers



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