Get the most out of your spa sanctuary with Sirona™ Calcium Booster. This fast-dissolving granular product raises calcium hardness levels in spas and hot tubs to help prevent foaming, protect equipment and keep water balanced. By maintaining proper hardness, you reduce the risk of corrosion and scaling — ensuring a safer, more enjoyable soak every time.

Stronger Protection for Your Spa Water

• Fast dissolving and goes to work immediately
• Helps prevent foaming and equipment corrosion
• Compatible with all sanitizers

Available Size(s)

• 1 lb container

Directions for Use

• Maintain calcium hardness between 200–400 ppm
• Add ¾ oz. per 500 gallons to raise hardness by 10 ppm
• Apply directly to spa water with circulation system running