• Spa Hardness Increaser

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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  • Maintaining proper water balance in your pool is critical to its overall health and longevity. Water balancers are products designed to help you achieve the correct alkalinity, hardness, and pH levels in your pool water. Alkalinity increaser (sodium bicarbonate), hardness increaser (calcium chloride), pH increaser (sodium carbonate), and dry acid (sodium bisulphate) are the most common.
    Assists in the protection of concrete spa surfaces.
    Excellent at increasing the level of water hardness.
    Totally soluble in spa water.
    It has a shelf life of several years if stored in cool, dry conditions.
    Will not affect the pH or total alkalinity.


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

Available Pack Sizes:

Product Part Number Pack Size
384025 500G


  •   Why do I need a water hardener for my spa?

    AquaPure Spa Hardness Increaser, is used to adjust the calcium hardness levels in your Spa water. Proper water hardness helps prevent corrosion of concrete spa surfaces, and improves water clarity, creating a safer and more enjoyable swimming environment.

  •   I have a Fibre glass or Vinyl pool, so why do i need Calcium in my pool?

    This is a good question that is often asked. Water will try to balance itself by removing Calcium from pool & Spa walls, but when we have an inert pool surface like Fibreglass or Vinyl there isn’t any calcium to be removed. so the water will start to find other ways to balance itself and want to take it from the bather. this is why we often have dry itchy skin when we get out of a pool or Spa that has low or no hardness to the balance.

    By adding Spa Hardness increaser, we actually make the water a much more comfortable experience to swim in.

  •   How do I add a Spa Hardness Increaser to my Spa?

    To add a Spa Hardness Increaser, start by determining the required dosage based on your Spas size and current calcium hardness levels. Dissolve the calculated amount of Spa Hardness Increaser in a bucket of water, then slowly pour the solution into the Spa while the Spa pump and filtration system are running. This helps distribute the Spa hardener evenly.

  •   Are there any risks associated with using too much Spa Hardness Increaser?

    Yes, using an excessive amount of Spa Hardness Increaser can lead to over calcification, resulting in scaling on Spa surfaces, filters, and equipment. It's crucial to follow the recommended dosage and regularly monitor your Spas water chemistry to prevent imbalances.

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