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Robarb Calcium Hardness Up (6 lb)

By Robarb

Clearance | Regular Price: $8.86

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Single $6.20

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Product Description

Robarb's Calcium Hardness Up is designed to prevent equipment damage, scale buildup, and foaming by increasing the level of water hardness in pool water. Increasing water hardness allows owners to prevent corrosion of pipes and fixtures can occur, requiring costly repairs. Calcium Hardness Up is compatible with chlorine, bromine, ozone, biguanide, and salt water sanitizing systems.

Product Dosage

1 lb per 10,000 gallons of water will raise calcium by 10 ppm.


  1. Using a Suitable test kit, determine the calcium hardness level.
  2. In general, the calcium hardness level should be 150 to 250 ppm.
  3. If the level is below 150 ppm, add Robarb Calcium Hardness Up by distributing the product over the water surface.
  4. 1 pound of Robarb Calcium Hardness Up will increase the calcium hardness 10 ppm in 10,000 gallons of water.


Calcium Chloride: 94%, Other Ingredients: 6%