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Keeping ponds and water gardens crystal clear and healthy for your fish isn't too complicated, maintaining a balanced eco-system involves ensuring the natural beneficial bacteria levels in the pond are correct. Biological filtration involves using natural bacteria which adheres to a medium like filter pads or lava rocks and these hungry little creatures remove unwanted chemicals from the water. As your pond water is pumped through the hungry growth on the filter media the water is polished and cleansed. Adding bacteria to a pond will help ensure no muck and sludge builds up and will help control annoying blanket weed and green waters.