I recommend you first use a flocculant. The best I've found was on Amazon, under swimming pool products. One gallon, priced at $48, will initially treat a one half acre pond (600,000 gallons). Maintenance doses, as may be required, use one half as much floc. It's made from crustacean shells. After using this stuff, I found I had earlier added too much blue dye, which my cloudy green water had hidden. It is nice to be able to see your fish milling about under the water waiting for feed. Fishing lures and bait become visible to the fish. Underwater lights glow through a much larger area. I refrain from naming it because it is not offered by the Resource advertisers. It is an industrial product offered for everything from swimming pools and ponds to industrial and sewer water clarification.
The other floc I have tried, RapiClear, costs $60 per gallon to treat 60,000 gallons. No comparison!
