Robelle Pool Calcium Up Granular 8 lb — Raises & Stabilizes Calcium Hardness, Fast-Dissolving

Robelle 8-Pounds Premium Pool Calcium Up is a dry calcium chloride formula designed to raise and stabilize your pool's calcium hardness to the recommended range for a safer, longer-lasting surface.

Keeping proper calcium hardness prevents surface etching, corrosion, and plaster damage while helping water chemistry stay balanced. Robelle's granular calcium up comes in an 8-pound container and is concentrated so you can precisely correct low hardness levels. Use a reliable calcium hardness test kit before adjusting levels and follow dilution and dosing steps to avoid overly rapid additions.

How do I test and know when to add this calcium up?

Measure calcium hardness with a calibrated pool test kit or digital tester. Compare the result to target ranges that vary by pool surface; if the reading is below the recommended range, add Robelle calcium up according to the dosing instructions.

• Vinyl pools: aim for 200–300 ppm
• Tile and exposed aggregate: 200–400 ppm
• Marcite, fiberglass, painted: 250–400 ppm
• Re-test after circulation to confirm target achieved

How do I add Robelle calcium up safely to my pool?

Do not dump the granules directly into the pool. Pre-dissolve the product in a plastic bucket filled with pool water, using up to 2 pounds of product per approximately 5-gallon bucket. Slowly pour the dissolved solution around the pool perimeter while the pump runs for even distribution.

• Use a plastic bucket—avoid metal containers
• Mix up to 2 lb per 5-gallon bucket of water
• Pour slowly along the pool's edge with circulation on
• For a 10,000-gallon pool, add no more than 10 lb every 2 hours

What does one container cover and how quickly will results show?

An 8-pound container provides a concentrated supply suitable for multiple adjustments depending on pool volume and how far below target your hardness is. In most pools you’ll see the corrected calcium hardness after adequate circulation and retesting—typically within a few hours to a day depending on dilution and turnover.

• 8 ounces will raise calcium hardness ~10 ppm per 5,000 gallons
• Smaller pools require proportionally less product
• Allow full circulation and then retest to verify levels
• Make incremental additions to avoid overshooting

Who this is for: Robelle 8-Pounds Premium Pool Calcium Up is for pool owners, service professionals, and maintenance teams who need a reliable, fast-acting calcium chloride product to bring low hardness back into recommended ranges. It’s especially useful for pools with soft water, newly filled pools, or after extensive water replacement. Follow testing and dilution instructions closely for safe, effective results and longer-lasting pool surfaces.