Robelle 32-Pounds Premium Pool Calcium Up | Calcium Hardness Increaser

Trusted calcium hardness support for a balanced pool

Robelle Calcium Up is a dry, granular solution designed to raise the total hardness of pool water. When hardness sits in the right range, you can help protect pool surfaces and keep your water chemistry steady. This 32-pound bag is intended for regular maintenance routines, offering a straightforward way to address low calcium levels without complicated mixes.

How it works

Calcium chloride supplies additional calcium ions to the water, increasing hardness rapidly. The product is designed to be compatible with a variety of pool finishes, and the dosing guidance is built to fit typical residential pools while encouraging careful monitoring with a reliable test kit.

• Calcium chloride for pools helps raise total hardness quickly
• Applied via a bucket dilution method with the circulating system on for even distribution
• Low hardness can lead to water balance issues; increasing hardness helps protect surfaces
• Ideal hardness ranges vary by surface: Vinyl 200–300 ppm, Tile/Exposed Aggregate 200–400 ppm, Marcite/Fiberglass/Painted 250–400 ppm

Usage tips and dosing guidance

For best results, test calcium hardness with a dependable test kit and follow the included chart. A practical rule of thumb is that 8 ounces raises hardness by about 10 ppm in 5,000 gallons of water, which helps you plan dosing increments with confidence.

• Mix the dry granules in a plastic bucket filled with pool water before distribution
• Dose at roughly 2 pounds per ~5 gallons of bucket water, then slowly pour around the pool perimeter
• With a 10,000 gallon pool, do not exceed 10 pounds in a 2-hour period

Robelle Calcium Up supports surfaces by maintaining a stable hardness level, which can reduce the risk of surface staining or etching associated with very soft water. While results can vary with pool size and existing chemistry, this product is formulated to be a practical addition to routine water care.

What you get

32 pounds of calcium chloride-based hardness increaser designed for consistent, user-friendly dosing, with guidance tailored to common pool types and finishes. The result is a more balanced water profile that aligns with standard recommendations for calcium hardness.