Calcium Hardness Up | 15 Lb | 1 Bag | GLB | (Heavy Duty For Pools)

GLB Calcium Hardness Up, 15 lb Bag (71251A) helps balance your pool’s calcium hardness, supporting stable pH and alkalinity for a more comfortable swim. This calcium hardness increaser protects equipment by reducing scale and corrosion, keeping water clarity inviting and equipment life extended.

Managing calcium hardness matters because it stabilizes overall pool chemistry, improves sanitizer efficiency, and minimizes mineral buildup. Use this product to dial in calcium levels without overcorrecting, ensuring water hardness stays within the ideal range for your pool.

• 15 lb bag provides reliable, on-hand calcium hardness adjustment
• Quickly raises calcium hardness to prevent pitting and corrosion
• Supports stable pH and alkalinity for swimmer comfort
• Reduces scale formation on heaters, pumps, and tiles
• Easy to apply with routine dosing and standard pool care
• Compatible with common sanitizers and filtration systems

Add GLB Calcium Hardness Up to your pool care cart to maintain balanced water and protect your equipment.