Spa Pure Hardness

Helps maintain Calcium Hardness levels between 150-300 ppm. Helps prevents foaming and equipment corrosion. Promotes better water balance; Compatible with all sanitizersWater needs calcium hardness. If your levels are too low, a small addition of 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