Calculate calcium chloride dose to raise calcium hardness in your pool. Ideal range is 200-400 ppm to prevent corrosion and scaling.
Enter current and target calcium hardness levels to calculate the required calcium chloride dose. The ideal range is 200-400 ppm.
Low calcium hardness makes water corrosive, damaging plaster, metal, and equipment. High calcium hardness causes scaling on pool surfaces and equipment.
Calcium chloride generates heat when dissolving — dissolve it in a bucket of water before adding to the pool. Add in multiple doses if raising by more than 100 ppm.
Calcium hardness (CH) measures the amount of dissolved calcium in pool water. The ideal range is 200-400 ppm. Low CH makes water 'hungry' for calcium — it will leach calcium from plaster, grout, and equipment, causing corrosion and pitting. High CH causes scaling and cloudy water.
To raise calcium hardness, add calcium chloride. Dissolve it in a bucket of water before adding to the pool — calcium chloride generates significant heat when dissolving. Add in multiple doses if raising by more than 100 ppm, allowing 6 hours between doses.
The only reliable way to lower calcium hardness is to partially drain and refill the pool with fresh water. There are no chemicals that effectively remove calcium from pool water. Prevent high CH by using a calcium-free pool salt and avoiding calcium hypochlorite shock.
The Langelier Saturation Index (LSI) is a formula that predicts whether pool water will be corrosive or scale-forming based on pH, temperature, calcium hardness, total alkalinity, and TDS. An LSI of 0 is ideal. Negative values indicate corrosive water; positive values indicate scale-forming water.
Yes. Salt water pools are more prone to calcium scaling because the salt chlorine generator (SWG) creates a high-pH environment near the cell. Maintain CH at 200-400 ppm and keep pH at 7.2-7.6 to minimize scaling on the SWG cell.