Hardness Raiser

AquaPure Hardness Increaser raises the hardness of water (the concentration of dissolved calcium) in your pool thus preventing the pitting of concrete-based pool walls and erosion of mortar and tile grout.

Reduces damage to Marblesheen and pebble finished pools, caused by low levels of calcium.

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Full description


Contributes to proper calcium levels and can contribute to water clarity by helping to prevent cloudiness or turbidity. Balanced water chemistry, including appropriate calcium levels, reduces the likelihood of scaling and mineral deposits, which can contribute to cloudy water.

  • Non-hazardous chemical

  • Assists in the protection of concrete pool surfaces

  • Excellent at increasing the level of water hardness

  • Totally soluble in pool water

  • Has a shelf life of several years if stored in cool, dry conditions

  • Will not affect the pH or total alkalinity

How to Use:

The product should be pre-dissolved in a bucket of water adding 2kg to 5lt of water

If more than 6kg is required per 50,000lt of pool water, dose separately and apply at least 12 hours apart

Dosage Rate: For an increase of 10ppm use 150g per 10,000 litres

The desired level is usually between 150 -200 ppm (Minimum for Quartzon 200ppm, Minimum for paint 150 ppm and Minimum pebble 100ppm)

  1. Test Water Hardness Regularly: Use a reliable pool water testing kit to measure the current calcium hardness levels in your pool. This will help you determine if the pool water needs adjustment.

  2. Add Slowly with Circulation: Pour the dissolved Hardness Increaser solution into the pool while the pool pump and filtration system are running. This helps ensure the even distribution of the product throughout the pool water.

  3. Spread Out Additions: If you need to add a significant amount of Hardness Increaser to your pool, consider spreading out the additions over a few days to prevent rapid changes in water chemistry.

  4. Monitor and Adjust: After adding Hardness Increaser, retest the pool water's calcium hardness levels to ensure you have achieved the desired range. Adjustments may be necessary if the hardness levels are still outside the recommended range.

  5. Maintain Overall Water Balance: Remember that calcium hardness is just one aspect of water balance. Keep an eye on other factors such as pH, alkalinity, and sanitiser levels to ensure your pool water remains safe and comfortable for swimming.

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