Calcium Hardness Increaser by EcoOne | Spa Water Balance, 28 oz

Restore Balanced Spa Water Safely

EcoOne Calcium Hardness Increaser is a pure calcium chloride granular formula designed to gently raise the calcium hardness in your spa or hot tub. The product is chlorine-free and free of phosphates and harsh additives, offering a skin-friendly option that blends smoothly as your circulating water moves through filters and jets.

Maintaining appropriate calcium hardness helps protect metal components, seals, and surfaces from corrosion, etching, and staining. With regular use, you may notice water that feels softer and more comfortable against skin, while your equipment benefits from steadier water chemistry. The formula is designed to work in harmony with EcoOne’s broader line of earth-friendly spa products, enabling a cohesive care routine that respects both people and the environment.

What makes this formula stand out

The hardness increaser uses pure calcium chloride to target water hardness without introducing chlorine-based additives. It is compatible with spa fixtures, heaters, and filters, helping you manage your water profile with predictable dosing when guidelines are followed. The 28 oz bottle is ready for regular maintenance alongside other EcoOne balancers and cleaners to keep your spa in good condition.

Key benefits

• Gently raises calcium hardness with a simple, predictable dose
• Chlorine-free, phosphate-free, and free of common irritants
• Supports protection of metal surfaces and equipment from common hardness-related issues
• Designed to be used alongside EcoOne spa care products for a balanced system

How to use

• With pumps running, test total hardness first. If below 250 ppm, proceed with dosing.
• Add one ounce (two tablespoons) per 500 gallons to raise hardness by about 10 ppm.
• Circulate water for several hours, then retest. Repeat as needed to reach the target range.
• Store in a cool, dry place and integrate with EcoOne's complete line for best results.

Why choose EcoOne

EcoOne spa chemicals are crafted to work together, delivering effective water balancing while remaining gentle on skin. The calcium hardness increaser is part of a broader, environmentally conscious suite designed to keep spas clean, sparkling, and safe for everyone, including those with sensitive skin.