Spa Hardness Plus
This is used to increase the levels of Calcuim Hardness in Spa and Hot Tub water.
Your spa and hot tub water needs to be between 100ppm and 200ppm.
Having low Calcium Hardness(very soft water) can cause the water to become corrosive which can result in staining, etching or distoring of different types of spa and hot tub surfaces.
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