Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

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.
this text gets replaced with bannerText

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: