Durachlor by Haviland
Hardness Increaser

Dry granular product for raising calcium hardness


  • Increases calcium hardness levels
  • Pure flakes minimize clouding in pool water


  • Prevents long term damage to vital pool components
  • Easy application


  • Ideal calcium hardness levels should be maintained between 200-400 ppm
  • Avoid increasing hardness more than 50 ppm every couple hours
  • Easy to use chart on packaging

Available Sizes

  • 4 lb pail
  • 10 lb pail
  • 25 lb pail or box
  • 50 lb pail

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