Spa Water Hardness Raiser

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

Keeping the correct level of Spa Hardness assists in the optimum comfort level to enjoy the spa experience.

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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

  • Assists in bather comfort

  • Excellent at increasing the level of water hardness

  • Totally soluble in pool water

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

  • Will not affect the pH or total alkalinity

How to Use:

AquaPure Spa Hardness Increaser is best added to the Spa water after mixing in a bucket of water as per the label instructions and then pouring the solution around the perimeter of the Spa.

Allow pump to run 4 hours prior to re-testing.

Dosage Rate: For an increase of 10ppm use 15g per 1000 litres.

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

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

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

  • Monitor and Adjust: After adding Spa Hardness Increaser, retest the Spa 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.

  • 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 Spa water remains safe and comfortable for Bathing.

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