My pond is less than one acre and I've had excellent luck clearing the water with Alum... Aluminum Sulfate. I mixed the Alum with water in a 55 gal drum and used a coffee can to distribute it around the pond. Don't over do it ... it will change the ph to a point where you could lose fish. Start with a small amount and wait 4 or 5 days to see your results. Reapply as needed.

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