Even in the deepest winter, the pond doesn't freeze over because
we keep the pump and waterfalls running. The waterfalls ice over
sometimes, but as long as the water is running underneath, it's
OK. We check the pond periodically to make sure that it hasn't frozen
over. It's important to have an opening in the ice for built up
ammonia and gasses to escape.
<-----The white pole in the center of the pond is PVC pipe which
we are using as a "tent pole." There are two legs which
rest on the bottom of the pond to stabilize the pole and a small
square platform on the top of the pole which supports black netting.
We covered the pond with this black netting material in mid-October
when the leaves began to fall. The netting keeps leaves and debris
out of the water. We leave the netting on all winter & remove
it in the spring.
The koi stop eating when the water temperature reaches about 50
degrees. In our area it is usually in late October. The fish become
more and more lethargic each day and start to huddle together in
the middle of the pond where the water is the deepest. They spend
the winter under their "hide" all jammed together in a