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Hello,

Here the thermometer can reach -43 degrees. I made a de-icer system for my pond to save my fish. Step by step guide with pictures:


http://www.usa-gardening.com/pond/water-garden-7.html

Since 2007 I nerver loose one fish with this system.

Read more: All my water gardening projects

Instructions en français (french instructions): Déglaceur pour bassin extérieur

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