Across
- 4. Impurities in water
- 6. Conversion of organic waste into humus
- 7. Waste water in sewers
- 9. Seeping of water into the ground
- 10. Conditions related to public health
Down
- 1. Increase industries
- 2. Continous circulation of water
- 3. Concrete or metal tank for treating sewage
- 5. Solid matter at the bottom of sedimentation tank
- 8. Drinkable water