Hardness Increaser

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Hardness Increaser

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Water Hardener is a calcium flake which works to maintain a healthy hardness to hot tub water.

Water hardener is a valuable ingredient in soft water areas. Soft water will lead to corrosion of the equipment & fittings of the hot tub. 


Product Benefits:

  • Easy to dose.
  • Long shelf life.
  • Prevents soft water from damaging your hot tub.

Safety & Use:

Chemical Data Sheet


  1. Using a jug add 2 teaspoons of Water Hardener to 1 Litre of cold water and stir until dissolved (Increases Hardness by 10mg).
  2. Ensuring the pumps are turned on add the dissolved Water Hardener to your hot tub.
  3. Run pumps for 30 minutes and retest water balance using a test strip.

Storage and Handling:

  • Store in a cool dry place
  • Keep out of reach of children
  • Do not get in eyes, on skin or on clothing
  • Wear protective gloves/protective clothing/eye protection/face protection

Need some help or advice? Call 0116 251 3378 or email us at customercare@hottubsuppliers.com



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