Spa Pure Hardness Increaser

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SpaPure Hardness Increaser

Water needs calcium hardness. If your levels are too low, a small addition of Spa Pure Calcium Hardness Increaser brings the levels up safely while not clouding the water. When levels are ideal, you will prolong the life of your spa. The water will also be less aggressive and corrosive.


  • Helps maintain Calcium Hardness levels between 150-300 ppm
  • Helps prevents foaming and equipment corrosion
  • Promotes better water balance; Compatible with all sanitizers
  • Made in the USA

Apply to the spa while the water is circulating or as it is being filled
1 oz. per 100 gallons of spa water will raise calcium hardness level approximately 10 ppm

Available Sizes
16 oz. bottle


Product Downloads
SpaPure Hardness Increaser SDS (dry)





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