SpaGuard Calcium Hardness Increaser 12oz 42636BIO Protect your spa surfaces and equipment with SpaGuard Calcium Hardness Increaser 12oz, a fast-dissolving granular formula that raises low calcium levels into the safe range to prevent corrosion and etching. Ideal for spas and hot tubs with soft or aggressive water, it steadily increases hardness without overshooting into scale-forming territory. Key Features & Benefits Prevents corrosion damage: Raises low calcium levels that can otherwise cause corrosive water, leading to damage of plumbing, jets, heaters, fixtures, and spa surfaces. Helps avoid etching and pitting: Protects acrylic and plaster finishes from etching caused by water that is too soft or aggressive. Steady, controlled hardness increase: Easy-to-use granular formula increases hardness gradually, reducing the risk of scale buildup and cloudy water from too much calcium. Supports balanced water chemistry: Helps keep calcium hardness in the recommended range so your overall water balance (pH, alkalinity, LSI) stays more stable and easier to manage. Convenient spa-sized bottle: 12oz size is perfect for spas and hot tubs, making accurate dosing simple for routine maintenance. Specifications Product name: SpaGuard Calcium Hardness Increaser Size: 12oz bottle Form: Granular calcium hardness increaser Active ingredient: Primarily calcium chloride, with small amounts of sodium and potassium chloride. Recommended calcium hardness range: Typically 100–200 ppm for most spas; 200–300 ppm for spas on BioGuard SoftSoak programs. Typical dosage: 1 tablespoon per 100 gallons raises calcium hardness by about 25 ppm. Application: With pump running on high speed, scatter directly over spa water; run pump for at least 30 minutes after addition. Do not pre‑dissolve, as the product generates heat when it contacts water. Item/Ref #: 42636BIO Keep a bottle of SpaGuard Calcium Hardness Increaser 12oz (42636BIO) on hand to quickly correct low hardness and help extend the life of your spa and equipment.
