SpaGuard Calcium Increaser raises calcium hardness in hot tub and spa water. The desired calcium hardness level in spa water should be 100 to 200 ppm. Low calcium hardness below 100 ppm could cause spa or hot tub water to be corrosive which may damage spa surfaces and/or equipment.

• Granular calcium chloride
• 1 tablespoon per 100 gallons increases calcium hardness~25ppm
• Prevents corrosion of equipment due to low calcium hardness
• Prevents etching of plaster due to low calcium hardness

Dosage

1 tbsp per 100 gallons of water will raise hardness by 25 ppm