Robelle 25-Pounds Premium Pool Calcium Up – Calcium Hardness Increaser

Balance Your Pool Water with Robelle Calcium Up

Robelle 25-Pounds Premium Pool Calcium Up is a dry granular calcium chloride product designed to raise total hardness in pool water to the recommended range. When calcium hardness runs low, water can become aggressive toward pool surfaces and equipment. This practical solution helps stabilize your water chemistry and protect surfaces over time, without abrupt changes to your routine.

Key benefits at a glance

• Calcium chloride for pools helps to harden water and support a stable balance.
• Rapidly increases total hardness, helping you reach the target range more efficiently.
• Supports protection against surface etching and minor staining by maintaining proper hardness.
• Ideal calcium hardness range varies by surface type: vinyl pools 200–300 ppm; tile or exposed aggregate 200–400 ppm; marcite, fiberglass, or painted pools 250–400 ppm.
• 8 ounces typically raises hardness by about 10 ppm for every 5,000 gallons of water.
• Using the product as directed helps avoid low-hardness issues that can affect surfaces and equipment.

How to use Robelle Calcium Up

First, test your pool water with a reliable test kit to determine current calcium hardness. If readings are below the target range, prepare a plastic bucket: fill with pool water and add up to 2 pounds of Robelle Calcium Up per roughly 5 gallons of water. Slowly pour the solution around the pool perimeter while the circulation system runs.

For example, in a 10,000‑gallon pool, do not exceed 10 pounds in a two-hour dosing window. The included dosing chart provides guidance based on your pool type and current hardness levels.

Practical tips and considerations

• Granular formula dissolves in water with minimal effort when mixed in a bucket first.
• Regular testing helps maintain the appropriate range for your pool surface type.
• Maintain a consistent dosing routine to support surface protection and overall water balance during the season.
• Store in a cool, dry place and keep out of reach of children.

Who should consider Robelle Calcium Up?

Suitable for vinyl, tile and exposed aggregate, marcite, fiberglass, or painted pools. Target ranges—200–300 ppm for vinyl, 200–400 ppm for tile/exposed, and 250–400 ppm for marcite, fiberglass, or painted—can guide dosing decisions.

Remember, this product is part of a broader pool care plan. For best results, pair it with proper filtration, regular testing, and a routine tailored to your pool type and climate.