Size (grams)


Easily dissolves and quickly increases calcium in spa water. Increasing the hardness of your spa water helps prevent etching, pitting and corrosion of spa surfaces and metallic components. Increases water hardness in one easy dose, helping enhance the life of your spa’s surfaces and equipment.

Directions for use: 

  1. Add 20g/1000L to raise the hardness 15g/L
  2. Mix (1kg max)  in a bucket of water before dispersing over the spa’s surface
  3. Run the spa filter for 4 – 5 hours before resetting
  • Easily dissolves
  • Raises calcium hardness instantly
  • Adds shine and sparkle to water
  • Protects spa surfaces and all plumbing
  • Contributes to bather comfort
  • All spa surfaces
  • All spa types
  • Suitable for ionised pools and spas
  • Weekly
  • Monthly
  • As required
  • Increase hardness levels
  • Improve appearance of spa water
  • Correct hardness levels extend the life of all spa surfaces and equipment