Hardness

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Hardness ppm
Soft: 0 to 75 ppm
Moderately hard: 75 to 150 ppm
Hard: 150 to 300 ppm
Very Hard: 300+ ppm

Moderately hard water is generally recommended for Koi fish.

Hardness is a measure of mineral ions in the water the preponderance of which is Calcium and Magnesium. General hardness GH is usually expressed in terms of the amount of calcium carbonate (CaCO3) present in solution. It is measured in degrees of German hardness (oDH) which can be converted to ppm by multiplying by 17.9.

 

Koi fish, Nishikigoi, Japanese Koi, Show Koi, Koi ponds, Butterfly Koi, Koi diseases, Koi identification pictures and everything on "HOW TO" information!

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