Controlling Calcium Hardness

Maintaining appropriate levels of calcium hardness is a key balance factor in basic recreational water care. Typically, water in a vinyl-lined or fibreglass swimming pool should contain a calcium hardness level of 175 to 225 parts per million (ppm), while the recommended range for plaster-surfaced pools is a little higher at 200 to 275 ppm. In addition, the overall balance of calcium hardness is directly related to other key balancing factors, total alkalinity (TA) and pH. Managing calcium hardness is extremely important due to the problems that can occur if it is not properly controlled.

By: Pool and Spa Marketing