Calcium hardness is an integral component of your swimming pool-spa water chemistry. Soft fill water can cause low hardness levels, which leads to the corrosion of swimming pool-spa surfaces and fixtures.
* Raises the hardness (calcium) level in your swimming pool-spa to the ideal range
* Prevents water from becoming corrosive and damaging your swimming pool’s
plumbing and heater
* Stops staining and etching of swimming pool surfaces caused by low hardness levels
* Great for use in areas where soft water is a problem
* Recommended dosage: 5 lbs. per 10,000 gallons to raise the hardness
approximately 40 ppm.