An endorheic lake, or one with very slow outflow, stratifies, most obviously by temperature. Consider installing a screw-like pump to mix the layers. The screw can easily be powered by wind, or possibly even by the temperature gradient.
This may of course drastically affect the pond's ecosystem. A solution in search of a problem. What flux thoroughly mixes the pond? Very slow might still be effective.
Stuff from the bottom of the pond getting caught in the pump is of course a problem.
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