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In most countries we receive clean drinking water, which comes into our homes through a set of pipes and then leaves as wastewater through another set of pipes called sewer pipes. All the wastewater flushed or drained from our homes and businesses must be treated so that it can be safely recycled back into the environment.

When the wastewater arrives at the treatment plant, the water by a combination of physical, chemical and biological processes is then treated so the water is less harmful and can be used again in the environment.

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