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.
Hardness is made up of calcium and magnesium - rock that is dissolved in your water. With this in your water, it is difficult to wash because the hardness prevents soap from lathering. Hardness also leads to scaling in pipes and water heaters. Hardness is described in grains per gallon (gpg) or parts per million (ppm).