How about digging a hole several feet deep to place the water filter in while not using it, and covering it with something with some insulating value. You could even place it in a garbage bag to keep it clean while in the hole.
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I was hoping to get some ideas for a large home Berkey system.
Those will not fit in a boot or sleeping bag, and I don't have a place for an inside fire.
Why not just empty it if you know the weather might freeze.
The internals of the filter would still contain water that would freeze and damage it.
If you are inside and need to prevent freezing. Simple is always better., a metal enclosure would help.I was hoping to get some ideas for a large home Berkey system.
Those will not fit in a boot or sleeping bag, and I don't have a place for an inside fire.