Balanced Calcium for a Better Spa Care Routine

Help protect your hot tub from the effects of low calcium hardness with SpaPure Hardness Increaser. These soluble, concentrated flakes raise calcium hardness to support balanced water, help prevent corrosion and surface etching, and reduce foaming associated with low hardness.

Whether you're filling your spa with fresh water or making a routine adjustment, getting calcium hardness in balance helps care for the surfaces and equipment behind every relaxing soak.

Features & Benefits

• Raises calcium hardness: Helps correct low calcium levels as part of a complete spa water-balancing routine.
• Helps prevent corrosion: Supports balanced water conditions that help protect your spa and equipment.
• Helps prevent foaming: Addresses low hardness as a contributing factor to foamy spa water.
• Helps protect delicate surfaces: Correcting low calcium hardness helps prevent surface etching.
• Soluble, concentrated flakes: A dissolvable formula for measured calcium-hardness adjustments.
• Compatible with all sanitizers and oxidizing systems: Fits into your existing spa water-care program.

How to Use

1. Test before treating: Check calcium hardness to determine the adjustment needed for your spa.
2. Apply with water moving: Add to the spa while the water is circulating or as the spa is being filled, following the container label.
3. Measure the correct dose: The supplied product directions specify 1 ounce (2 tablespoons) per 500 gallons of water to raise calcium hardness by 10 ppm. Follow the current container label for complete measuring and dosing instructions.
4. Retest as directed: Follow the label's circulation and retesting instructions before making further adjustments, and maintain the hardness range recommended by your spa manufacturer.

Always read and follow the product label for complete dosing, handling, and safety instructions. Never mix chemicals together. Confirm water balance and sanitizer levels meet your spa manufacturer's recommendations before soaking.