I have a submersible pump, I am curious about what to do with my pond in the winter. It can sometimes get below 0 here in Colorado. I have a double level pond, my 1250GPH pumps sucks from the bottom pond and then out of the pond through a garden hose, under some rocks and to the top of my waterfall. My filter is connected before the pump underwater.
My concern is that if it gets too cold, the water will freeze in the hose going to the waterfall and it will super heat my pump and cause it to fail.
I have seen several suggestions on what to do, but I was hoping to get some advise from people that have had to change their ponds in actual winters.
As I see it, my options are:
1. Turn off the pump and just use a deicer in both ponds. I assume that algae will not be a problem if the pump/filter is turned off during the winter.
2. Leave it on and allow the waterfall to create a natural hole in the ice. Turn it off on really cold days? Does anyone know at what temperature running water will freeze in a hose?
3. re-route the hose so that it bubbles up to the surface in just the lower pond, keeping the entire hose below the surface. - I have most of my fish in the lower pond, I have 3 small ones in my upper pond that I can catch and transplant to the lower pond for the winter (hopefully).
this is my first winter with a pond and I am kinda lost here.
Thanks for the help. Sorry for the long post.
Here is a pic that that I took during the building phase that shows my layout.