Answer
How much does it cost to maintain a pond?
Low for a balanced pond: modest pump electricity and seasonal upkeep, no chemicals.
In short
Far less than people fear, especially a balanced ecosystem or natural pond, where the biology does most of the work and there are no chemicals. The main costs are the modest electricity for a pump and occasional seasonal upkeep. A well-designed pond is cheap to run; a poorly balanced one is the expensive kind.
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