In winter we bring in the large filter so as not to damage the delicate uv filtration system, and (in theory) not kill the good bacteria that live within it. We like to keep the pump and filter going for as long as safely possible each November so we can watch the creation of the winter waterfall. A beautiful water garden feature, even in the cold months! You have to be careful and watch it though: if the ice builds up too much, the water will start to back up and go UNDER the liner rather than back into the pond. We learned that the hard way one year. But if you keep a daily eye on it, you can create your own beautiful, and natural, ice sculpture right in your own back yard.
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