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.
It is recommended that the results of total alkalinity be considered before adjusting pH. The direction of pH change, or even the need for adding chemicals, is greatly influenced by the level of total alkalinity. Total alkalinity does not vary quickly and often is only tested once a week.Calcium Hardness Levels. Tests for calcium hardness are performed at the beginning of the swim season, when you start up a new pool or after draining and refilling a pool or spa. After that, they only need to be done every three months or so.otal alkalinity does not vary quickly and often is only tested once a week. Calcium Hardness Levels. Tests for calcium hardness are performed at the beginning of the swim season, when you start up a new pool or after draining and refilling a pool or spa. After that, they only need to be done every three months or so.