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Description: Fishery Cooperatives in the Eastern Kolkata Wetlands (on the outskirts of the metropolis) channel wastewater from the municipal systems to fishponds, where organic waste in the waters settles down and serves as food for the fish. When the water levels in the fish ponds rise the fishermen release water through outlets which is much more clean than when it came in. The water is clean enough to be released into river systems in the area.nnOne wonders why not more cities have such kidney systems, ev
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