SpaChoice Pool Calcium Chloride Granular 25 lb — Fast-Dissolving Calcium Increaser for Pools

Keeping calcium hardness in the correct range helps preserve pool finishes and equipment. This concentrated granular formula dissolves in water and is applied around the pool while the circulation system runs. Test your pool’s calcium hardness with a reliable kit first, then follow the product dosing chart and mixing steps for even distribution and safe results.

How do I use this calcium increaser correctly?

Measure your pool’s current calcium hardness, determine the pounds needed from the included chart, then pre-dissolve the product in a plastic bucket of pool water. Pour the solution slowly around the pool perimeter while the pump is running to ensure even circulation and prevent local high concentrations.

• Pre-dissolve up to 2 lb per 5-gallon bucket of pool water.
• Slowly pour along the pool edge while the filter is operating.
• Wait and retest hardness after full circulation time before adding more.

What are safe dosing limits and timing for a typical pool?

Follow the package chart for accurate dosing based on pool volume and current hardness. For a 10,000 gallon pool, do not add more than 10 pounds within any 2-hour period to avoid sudden spikes; allow the water to circulate and mix before additional treatments.

• 8 ounces increases hardness ~10 ppm per 5,000 gallons (approximate).
• Maximum recommended pace: 10 lb per 2 hours for 10,000 gallons.
• Retest hardness after circulation to confirm target range.

Which hardness range should I aim for by pool type?

Target calcium hardness varies by surface. Vinyl pools generally need slightly lower levels than plaster or exposed-aggregate surfaces; follow these ranges to protect surfaces from etching or scaling and to maintain balanced water chemistry.

• Vinyl pools: 200–300 ppm.
• Tile and exposed aggregate: 200–400 ppm.
• Marcite, fiberglass, painted pools: 250–400 ppm.

How does this product help pool maintenance overall?

Maintaining recommended calcium hardness reduces the risk of surface damage and helps water remain chemically balanced, protecting heaters, pumps, and finishes. This product quickly raises hardness so you can correct low-calcium conditions and then fine-tune with routine testing.

• Rapidly increases total hardness to target ranges.
• Reduces potential for surface staining, etching, or corrosion.
• Works with standard pool circulation systems for even distribution.

Who is this for: Pool owners and maintenance professionals who need a reliable, concentrated calcium chloride product to correct low hardness in residential or commercial pools. It’s suitable for all common pool finishes when used according to directions and after confirming current hardness with a test kit. Always follow label instructions, wear appropriate PPE when handling granular chemicals, and add the pre-dissolved solution gradually while the pool is circulating.