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.
1 Calcium hardness refers to the amount of calcium present in the water. If the calcium levels are too low your water will become corrosive, potentially ruining the body of your pool.  Cyanuric acid protects the chlorine in the water from the sun's ultraviolet rays.