Southern Association of Colleges and Schools Commission on Colleges. Bob Jones University is a candidate for accreditation with the Southern Association of Colleges and Schools Commission on Colleges to award associate, baccalaureate, masters, and doctorate degrees.
hthÂ® calcium hardness increaser, 4 lbs. hthÂ® calcium hardness increaser, 4 lbs., is used to raise the calcium hardness of swimming pool water. Low calcium hardness may cause the pool water to be corrosive, resulting in damage to pool surfaces and equipment.
UNDERSTANDING CALCIUM HARDNESS. Calcium hardness must be actively managedâalong with pH and total alkalinityâto keep water in proper chemical balance. Current industry standards call for maintaining calcium hardness in the ideal range of 200â400 ppm in pools and 150â250 ppm in spas. The Role of Calcium Hardness in Water Balance. While hardness in water consists of both calcium and magnesium salts (total hardness), only the calcium component is relevant in the water balance calculation for pools and spas.