HTH Calcium Hardness Up 67059 – Raise Pool Calcium Hardness & Protect Surfaces (4 Lbs)

Take control of your pool’s balance with the HTH Calcium Hardness Up formula. This 4 lb product is designed to raise the calcium hardness in your pool water, helping to fortify surfaces and equipment from the wear and tear that can accompany softer water. By boosting hardness, you can support a more stable water balance and help keep your pool looking and feeling pristine, especially when paired with regular testing and routine maintenance. The calm, deeper hues of a balanced pool water become more noticeable as mineral levels settle into a safe range, reducing the potential for corrosion-related issues and helping your pool feel more dependable for daily swims and weekend gatherings.

HTH emphasizes compatibility with all pool types, making this hardness increaser a versatile choice whether you own a vinyl, concrete, fiberglass, or plaster pool. Proper hardness levels can contribute to a gentler feel on pool liners, while supporting metal and plastic components, and potentially reducing the likelihood of surface etching or wear over time. While the product does not replace a complete pool chemistry routine, maintaining a consistent calcium level can be a meaningful part of your overall maintenance plan.

Key benefits

• Rises calcium hardness in pool water to protect surfaces and equipment from damage
• Works with all pool types, including vinyl, concrete, fiberglass, and plaster
• Helps prevent water from becoming corrosive by maintaining balanced mineral levels
• Protects liners, metal, and plastic surfaces, as well as pool equipment, from wear
• Designed to be used alongside standard testing practices to keep calcium levels within a safe range

Usage and maintenance guidance

For best results, add as directed and monitor calcium hardness regularly. Maintain targets within 200–500 ppm, a range commonly associated with balanced pool water. Consistent testing helps you adjust dosing as needed, ensuring your pool remains durable and visually appealing.

• Test weekly with a reliable test kit or strips to track calcium levels
• Balance calcium hardness first, then proceed with other chemistry adjustments as needed
• Follow dosing instructions on the product label for accurate results
• Re-test after dosing to confirm the target range and avoid overshooting

HTH Calcium Hardness Up is a useful tool in a broader pool care routine. When used as part of a regular schedule, it can contribute to steady water balance, improved surface protection, and a more confident maintenance routine. Pair this product with routine tests, proper cleaning, and ongoing monitoring to help your pool stay clear and inviting all season long.