| Dayleen,
Our cold snaps are generally short lived around these parts. I checked water temp yesterday and it was 38-40 in my large pond. It was about the same in some smaller ponds without waterfalls. I ran the waterfall all last winter without problem. I'm afraid if I do shut it off freezing will damage the plumbing lines up to the waterfall and possible even crack the streambed. My koi are pretty well adapted to the cold. Some have been wintering outdoors for over ten years. It may be survival of the fittest but they are nice koi, and not show koi. How much harder on a koi would 36 degrees be compared to say 40 degrees?
Mitch |