Pool Calcium Hardness Calculator
Calculate the exact amount of calcium chloride to raise your pool's calcium hardness and prevent corrosion or scaling.
Calcium Hardness Calculator
Prevent corrosion and scaling with proper calcium levels
General Range: 200 - 400 ppm
Low calcium causes water to become aggressive and corrode surfaces and equipment. High calcium causes scaling on surfaces and in pipes.
Pool Volume
20,000 gallons
Amount to Add
27 lbs
Calcium Chloride Flakes (77%)
Tips
• Pre-dissolve, add slowly
• Pre-dissolve in bucket of pool water before adding
About Calcium Hardness
Calcium hardness measures the amount of dissolved calcium in your pool water. Proper levels protect your pool surfaces and equipment. The ideal range is 200-400 ppm, varying by pool surface type.
Ideal Ranges by Surface
Plaster/Gunite: 250-350 ppm (higher is better)
Vinyl Liner: 150-250 ppm
Fiberglass: 200-400 ppm
Problems from Imbalance
Low calcium: Water becomes "aggressive" and extracts calcium from plaster, grout, and equipment.
High calcium: Scale deposits on surfaces, pipes, and equipment; cloudy water.