SeaKlear Spa Calcium Increaser - Quart

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Product Number: 1140402
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SeaKlear Spa Calcium Increaser - Quart Bottle

SeaKlear Spa Calcium Increaser is used to up the calcium hardness levels in hot tub water, particularly in areas with low-mineral fill water. Low hardness can damage surfaces and erode equipment. Before adding Calcium Increaser, test the water to determine hardness levels. Ideal hardness level is in between 200-400 ppm.


To increase hardness at rate of 7ppm, add 1 oz. of product per 500 gallons of water.

  • Test water and adjust accordingly with Calcium Increaser
  • Pour product directly into spa water with equipment turned ON
  • Run the filter for 1-2 hours
  • Retest the water after 20 minutes, repeat steps as necessary