Then you know that we have wild temperature swings here. And unpredictable winters. Last winter our pond froze and thawed completely at least 5 times That's the first time in six years that has happened. Every other winter, once the pond froze it stayed frozen until spring. When I mentioned turning the "pond" on and off, of course I meant the pump. The idea of having to watch the weather to decide if the pump should stay on or be turned off all winter long is exhausting to think about. And that's not being lazy - just practical.