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JBL GH General Hardness Test


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JBL GH General Hardness Test

Product Description

  • Recommended level for fresh water: 8 - 20° dGH
  • 1 drop = 1° dGH.
  • Colour change from red to green.
  • A higher general hardness in the aquarium compared to that of tap water suggests that water was topped up rather than renewed!
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