Puri Tech Calcium Hardness Increaser Plus — 10 lb 94% Calcium Chloride, Fast-Dissolving to Prevent Corrosion & Staining

Keeping pool water chemistry balanced includes maintaining the right calcium hardness level. Low calcium hardness can accelerate wear on plaster, metal fixtures, and equipment, while overly high levels can cause scaling. Puri Tech's Calcium Hardness Increaser Plus is formulated to quickly and evenly raise calcium hardness, helping preserve pool surfaces and hardware. The product ships in a convenient 10 lb resealable bag for easy storage and seasonal use.

How quickly will this product dissolve and affect my pool water?

The Puri Tech formula is fast-dissolving to promote even distribution throughout the water, reducing localized concentration spots. You’ll generally see the chemical disperse within minutes, though full mixing depends on pump circulation and water volume.

• Fast-dissolving 94% calcium chloride granules for rapid dispersion.
• Best results when added with pump and filter running for several hours.
• Use small, measured additions to avoid sudden overcorrection.

How do I dose this 10 lb bag for my pool size?

Dosing varies by initial hardness reading and pool volume; always test water before adding chemicals. Start with recommended increments and retest after circulation to reach the target calcium hardness level without overshooting.

• Test water hardness first using a reliable pool test kit.
• Add product in measured amounts per manufacturer dosing table based on gallons.
• Retest after several hours of circulation and repeat as needed.

Will this prevent corrosion and staining on pool surfaces?

Raising calcium hardness to an appropriate range helps reduce aggressive, corrosive water conditions that can attack plaster and metal. While it contributes to corrosion and stain prevention, it works best as part of a balanced water-care program including proper pH, alkalinity, and sanitizer levels.

• Increases calcium hardness to reduce water aggressiveness.
• Helps protect plaster, tile grout, and metal fixtures when used with balanced chemistry.
• Not a standalone fix—combine with pH and alkalinity control for full protection.

How is the product packaged and stored for seasonal use?

The 10 lb resealable bag is designed for convenient handling and storage between treatments. Reseal the bag after each use and store in a cool, dry place away from moisture and sunlight to maintain product effectiveness.

• 10 lb resealable bag reduces spills and keeps granules dry.
• Store out of direct sunlight and moisture to preserve performance.
• Label includes basic dosing guidance—keep instructions handy for repeat use.

Who is this for: Puri Tech Calcium Hardness Increaser Plus is intended for pool owners, service pros, and maintenance teams who need a reliable, high-purity calcium chloride product to raise hardness levels. It suits in-ground and above-ground pools and spas where low hardness is causing potential surface or equipment issues. Use it as part of a comprehensive water-balance routine—test, dose, circulate, and retest—to maintain healthy pool surfaces and components.