Robelle Pool Calcium Up Granular Calcium Chloride 32 lb — Raises & Stabilizes Calcium Hardness for Pools & Spas

Robelle 32-Pounds Premium Pool Calcium Up is a granular calcium chloride treatment that raises and stabilizes your pool's calcium hardness to the recommended levels.

Maintaining proper calcium hardness prevents surface damage and helps water chemistry stay balanced. Robelle Calcium Up is a dry, fast-dissolving granular formula designed for backyard pools, spas, and commercial pools. Use it after testing calcium hardness with a reliable kit, and follow dosing guidelines to gradually bring levels into the ideal range for your pool surface type.

How do I know when my pool needs calcium added?

Test total hardness with a quality test kit; low readings indicate the need for calcium. Different pool finishes require different target ranges, so measure and compare to the appropriate range before adding product.

• Vinyl pools: aim for 200–300 ppm.
• Tile and exposed aggregate: aim for 200–400 ppm.
• Fiberglass, marcite, painted surfaces: aim for 250–400 ppm.
• If hardness is below these ranges, plan a staged addition using the included chart.

How should I add Robelle Calcium Up to my pool safely?

Dissolve the granules in a plastic bucket of pool water before adding to the pool; never add the dry product directly to the pool. Add the prepared solution slowly around the pool perimeter while the pump runs, and follow the product’s per-period limits for large volumes.

• Dissolve up to 2 pounds of product per 5-gallon bucket of pool water.
• Slowly distribute the dissolved solution around the pool with circulation on.
• For a 10,000-gallon pool, do not add more than 10 pounds every 2 hours.
• Allow circulation and retest before repeating additions.

How much calcium will a given dose add to my pool?

The product provides a predictable increase in calcium hardness when dosed according to pool volume. Use the included conversion chart or testing to determine the dose needed to reach your target ppm without overshooting.

• 8 ounces of product raises calcium hardness by about 10 ppm in 5,000 gallons.
• Scale dose to your pool’s gallon capacity using the product chart.
• Add gradually and retest after circulation for accurate control.

Will adding calcium prevent damage to my pool surface?

Maintaining calcium hardness within the recommended range reduces the risk of etching, staining, and corrosion associated with low hardness. Properly balanced hardness supports long-term surface integrity when combined with correct pH and sanitizer levels.

• Prevents etching and surface deterioration linked to very soft water.
• Helps reduce staining caused by unstable water chemistry.
• Works best as part of a routine water-testing and maintenance plan.

Who this is for: Robelle 32-Pounds Premium Pool Calcium Up is intended for pool owners, service professionals, and facilities managers who need to raise and control calcium hardness reliably. It's suitable for vinyl, tile, exposed aggregate, fiberglass, marcite, and painted pools when used per instructions. If you regularly test and adjust water chemistry, this concentrated granular formula gives predictable, controlled increases in total hardness to protect surfaces and maintain balanced water.