Robelle Calcium Up Granular Pool Calcium Chloride 16 lb — Fast‑Dissolving, Accurate Hardness Adjustment

Robelle 16-Pounds Premium Pool Calcium Up is a granular calcium chloride treatment formulated to raise your pool's calcium hardness to the recommended range quickly and safely.

Keeping pool calcium hardness within the correct range protects surfaces and equipment while maintaining water balance. Robelle Calcium Up is a dry, fast-dissolving formula designed for routine adjustments when test kits show low calcium hardness. Use it only after measuring calcium levels and follow the dosing guidance to avoid overcorrection.

How do I determine when to add Robelle Calcium Up?

Test total calcium hardness with a reliable pool test kit before any addition. Different pool finishes have different target ranges, so compare your measured ppm to the recommended values before treating.

• Vinyl pools: aim for 200–300 ppm.
• Tile and exposed aggregate: aim for 200–400 ppm.
• Marcite, fiberglass, painted surfaces: aim for 250–400 ppm.
• Retest after dosing and let the circulation run for at least two hours between large additions.

What is the proper way to dissolve and add this granular calcium chloride?

Dissolve the measured Calcium Up into a plastic bucket already filled with pool water, never add water to dry chemical. Mix slowly and pour the diluted solution around the pool perimeter while the pump is operating to distribute the product evenly.

• Use up to 2 pounds of product per approximately 5-gallon bucket of water.
• Pour slowly around the pool while the filter pump runs for good circulation.
• For a 10,000-gallon pool, limit additions to 10 pounds per two-hour period to avoid spikes.

How much will an amount of Robelle Calcium Up change my pool's hardness?

Robelle provides predictable adjustments so you can fine-tune hardness without guesswork. Small, incremental additions are safer than large, single doses to keep water balance steady and protect surfaces.

• 8 ounces of this product raises calcium hardness roughly 10 ppm in 5,000 gallons.
• Calculate required pounds based on pool volume and current vs. target ppm.
• Allow circulation and retest before adding more product.

Are there safety or compatibility considerations I should know?

Handle as a concentrated chemical: avoid direct skin or eye contact and keep out of reach of children. Use plastic buckets and tools; metal containers can corrode with calcium chloride solutions.

• Never mix dry chemicals together; always dissolve in water first.
• Use protective gloves and eyewear when handling granules.
• Do not exceed recommended per-period dosing to prevent sudden hardness spikes.

Who is this for: Robelle 16-Pounds Premium Pool Calcium Up is aimed at pool owners, service technicians, and facility managers who routinely monitor water chemistry and need a dependable granular product to raise calcium hardness to manufacturer-recommended ranges. It’s appropriate for all pool types listed above and for anyone who prefers precise, measured adjustments to protect plaster, tile, vinyl, or fiberglass finishes.