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Used to increase the Kh in freshwater aquarium.
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The correct Carbonate Hardness (KH) is mandatory for clear aquarium water and healthy fish and plants as well as a stable pH. KH is a measurement for the total amount of dissolved carbonates in the water.
When the KH is too low the pH can fluctuate which is very harmful for the aquatic life.
Ideal value: 6 - 8° DH