What are the correct pond water parameters for KH and for Calcium


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cas

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I've read that Goldfish like Kh of 100 – 160. Koi like 105 ppm.

For Gh (general hardness - calcium, magnesium) Goldfish do well between 120-200 ppm. Koiphen.com says 80-150 for koi. Best to have KH and GH the same.

Carbonate hardness (KH) will prevent low PH (PH crash) and Calcium hardness (part of GH) will prevent high PH.
 

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