We have a 1000 gal. pond that we dug for 5 ducks , 1 goose and approx. 30 goldfish that we dug last fall and we have been having problems with it since it thawed out. So we put in a filtration system. I got a Laguna 1400 flter with a UV light and an aerator. Not enough...was having major green water and sludge problems so about 1 month ago I started using Green Clean algecide and Microbe Lift PL. Green Clean killed all the algae so the water is clearer but the dead algae settled on the bottom and now the water appears brown. I am hoping that the bacteria from Microbe Lift will take care of this. Believe it or not, the fish are still alive and reproduced over the winter so that is a good sign. It will be a slow process and as long as I allow the ducks in the pond, the water will never be completely clear, but I am optimistic that this will work. We built this set up for them and they love to play in it. Just big enough for them to dive.
One thing, not all algecides are equal and safe for waterfowl. The ad for Green Clean read that once diluted in water, it is non-harmful to animals. I purchased all my stuff from Webb's Water Gardens.