Clorox Pool&Spa Calcium Hardness Increaser, 4LB – Prevents Corrosion & Staining

Balance and clarity for your pool

Maintaining proper calcium hardness helps protect plaster surfaces, metal fittings, and the overall comfort of your pool environment. CLOROX Pool&Spa Calcium Hardness Increaser is designed to gently raise low hardness levels, promoting a more stable water balance without harsh swings.

Low calcium hardness can invite a more aggressive water profile that may lead to surface damage or equipment wear over time. By increasing hardness, you may experience a steadier pool chemistry, clearer water, and less frequent adjustments during the season.

Key benefits you may notice

• Prevents corrosion, etching, and staining of pool surfaces and fixtures
• Raises low total hardness to stabilize water balance
• Helps extend pool equipment life by reducing corrosive conditions
• Ideal for plaster pools and areas with soft water
• Works well with the Clorox Pool App for testing and dosage guidance

How to use

• Test your pool water to determine current calcium hardness
• Follow packaging instructions or use the Clorox Pool App for recommended dosage
• Evenly broadcast the product around the pool and run the pump to mix
• Re-test after the recommended contact time and adjust as needed

Compatibility and support

Designed for plaster pools and soft water areas, this hardness increaser integrates with your existing maintenance routine and supports consistent results without altering other parameters abruptly.

Clorox Pool App offers testing assistance and personalized dosage tips to help you manage your water efficiently and confidently.