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At wastewater treatment plants the water travels through a series of tanks, each designed to gradually remove the contaminants in order to return the water to use.

Each of the machine's treatment tank or greenhouse, is integrated with a full-bodied ecosystem represented by different groups of living organisms from microscopic algae, bacteria, fungi, zooplankton to snails, fishes and clams. The sewage treatment plant needs to be environment friendly, and rust and leak proof.

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