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Galvanized watering trough is producing green colored water

September 1, 2013

Q. I have two large 6' round galvanized "horse watering" troughs used as ornamental fish ponds with Koi and Goldfish. One is very old and does fine. The other is new, and I note when filled with well water, the water turns green overnight. Bio filters do not remove the green. Is this from the new zinc? If this is the cause, is there anything to do to stop it ? It does not seem to bother the fish, except they are pretty hard to see.

James West
- Franklin, Indiana, USA

September 14, 2013

A. Sir,

Perhaps the green solution is one of the following:
1)Trivalent chrome from hex chrome quench.
2)Nickel Chloride from 0.05% nickel in the zinc bath.
3)Divalent iron from the water.

Regards,

Dr. Thomas H. Cook
Galvanizing Consultant - Hot Springs, South Dakota, USA

adv.
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