water that contains less than 100 ppm of calcium and magnesium; pools and spas should never be filled with soft water from a softener; water with less than 100 ppm of hardness should be increased to a minimum of 150-200 ppm using calcium chloride
water that contains less than 100 ppm of calcium and magnesium; pools and spas should never be filled with soft water from a softener; water with less than 100 ppm of hardness should be increased to a minimum of 150-200 ppm using calcium chloride
