In The Swim Calcium Hardness Increaser 45 lb Bucket granular calcium chloride that quickly raises pool calcium hardness levels to prevent etching and corrosion.

Quickly raises calcium hardness levels in swimming pools
Active Ingredient: Calcium Chloride 94%
Granular form for fast acting results
Prevents low calcium levels that can cause corrosion, pitting, erosion, and etching of pool surfaces
Use In The Swim calcium hardness increaser when your calcium hardness level drops below 150 ppm
Maintain proper calcium hardness to improve pool water quality
Also great to melt snow and ice
Ideal calcium hardness range of 180-220 ppm for most swimming pools
Dosage: 6 pounds per 10,000 gallons increases calcium hardness level by approximately 50 ppm

In The Swim - Calcium Hardness Increaser, 45 lbs