Quote:
Originally Posted by Hemlock140
The electricity used to keep a small water pump going is negligible, maybe $20/year at average kWh rates. The waterfall on my fish pond runs 24/7. I turn it off only if it ices over during a cold spell in winter.
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If you have plants in your pond, you need to keep it running to help oxygenate the water. Plants give off carbon dioxide at night. In winter, I run a heater, and the movement of the water by the pump, keeps the whole pond comfortable for the fish.