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.
Pool water problem - calcium hardness. Total hardness in swimming pools is a measure of all the dissolved minerals such as calcium, magnesium and sodium. For practical purposes we usually use calcium hardness as a reference in pool water chemistry. The recommended level for calcium hardness is 200 - 400 ppm, and both high and low levels result in swimming pool problems.