do you have a filter in the pond?
most types of biological media supplements that are safe for koi ponds will be fine in your pond. i use biological clarifier for beneficial bacterial boosts and seachem's prime (used for freshwater aquariums for eliminating chlorine and some wastes. if you have a garden center that deals in true koi ponds (not home depot), then they should have no problem pointing you in the right direction.

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