WRITE ONE WORD FOR THE FOLLOWING
1. The substances which make water unfit for human consumption.
2. The process of removing pollutants from wastewater.
3. The underground network of small and big pipes for carrying sewage/wastewater.
4. The set up for the removal of physical, chemical and biological pollutants from wastewater.
5. The diseases caused by the polluted / contaminated ground water.
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