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

[Bossman]

I am looking for the range of KH and Calcium for my pond

 

[mrsclem]

Kh showld be around 100, not sure about calcium.

 

[cas]

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.