Expert Verified Updated: March 2026

Calcium Hardness Increaser Calculator

Determine how much Calcium Chloride is needed to reach ideal hardness levels and protect pool surfaces.

Quick Conclusion
The Calcium Hardness Increaser Calculator provides instant dose calculations for pool maintenance, helping you maintain perfect water balance and extend equipment life.

Technical Comparison

Surface TypeIdeal CalciumDanger Level
Plaster/Gunite250-450 ppmLow Ca causes etching
Vinyl/Fiberglass175-225 ppmLow Ca is less critical

Why Hardness?

Soft water is 'hungry' and will etch plaster and corrode metal equipment.

Actionable Steps

Adding Calcium

Pre-dissolve in a bucket or broadcast across the deep end.

⚠️

Safety Warning: Calcium chloride generates heat when dissolving. Never add water to the chemical; add chemical to water.

Pro-Tip

Adding calcium chloride generates heat as it dissolves. Mix it in a bucket of water *before* adding it to the pool to prevent it from settling on the floor.

Frequently Asked Questions

Ideal range?

For plaster pools, 250-450 ppm is ideal.

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