Puri Tech Powder Pool Chemicals 50 lb Calcium Hardness Increaser Plus for Swimming Pools & Spas

Puri Tech Pool Chemicals 50 lb Calcium Hardness Increaser Plus for Swimming Pools & Spas Increases Calcium Hardness Levels Prevents Surface Staining Dosage: 2,000 Gallons: 1.5 Lbs to increase hardness 50ppm, 3 Lbs/100ppm, 6.25 Lbs/200ppm 5,000 Gallons: 3 Lbs to increase hardness 50ppm, 6.25 Lbs/100ppm, 12.5 Lbs/200ppm 10,000 Gallons: 6.25 Lbs to increase hardness 50ppm, 12.5 Lbs/100ppm, 25 Lbs/200ppm 20,000 Gallons: 10.5 Lbs to increase hardness 50ppm, 25 Lbs/100ppm, 50 Lbs/200ppm Active Ingredients: Calcium ChlorideYou may also like Puri Tech 3" Chlorine Tablets for Pools – 8 lb Individually Wrapped, Long-Lasting, Slow-Dissolving Sanitizer for Swimming Pool Water.