we have a koi pond that w... #215734 - Ask Extension


we have a koi pond that w... #215734

Asked October 06, 2014, 8:59 AM EDT

we have a koi pond that we inherited when we bought our home. We have been putting Koi in aqauriam for the winter however we would like to try aerating the pond so that we can leave them out. We are wondering how to go about this and if there are any recommendations regarding size of aerator, success rate, etc? Any thoughts or ideas welcome! Thanks!!

Polk County Wisconsin

Expert Response

There are 3 ways often employed to keep a section of open water over ponds during cold winter: air circulation, water circulation and heaters.

There is quite a bit of information on this available on the web (e.g. google “de-icing koi ponds”)  Here is one example: http://www.drsfostersmith.com/pic/article.cfm?articleid=626

Also couple of Youtube videos:



Small floating pond de-icers are the least expensive ($40+), They only provide a small round window however, and some comments suggest they might not be sufficient in frigid temps.   The picture on Stoney Creek’s website provides an example.  http://www.stoneycreekequip.com/form/deice.htm
With techniques described in the second Youtube video this may be adequate. 

Water pumps and aerators designed specifically for fish ponds start at about $300 and go up.  

Pentair Aquatic Ecosystems has an aerator unit for small ponds for $350:

Kasco Marine carries fairly heavy duty products

All the above suppliers have reportedly good tech service people to help make a good selection for your need.

Chris Weeks Replied October 06, 2014, 3:02 PM EDT

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