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During severe winter weather, the surface of a garden pond can freeze over for long periods, trapping waste gases released by decaying, submerged vegetation. These gases may build up to toxic levels and harm fish. A pond heater allows an area of the water surface to be kept free from ice, so the gases can escape. It also allows the pond water to re-oxygenate and gives birds and other animals a vital source of water during very cold weather.
