Across
- 3. where drinking water originates from
- 5. the type of light used to sterilise sewage
- 6. the technical term for drinkable water
- 11. the chemical that is used to sterilise drinking water
- 12. process that removes salt from water
- 13. the process that kills bacteria in water
- 17. the location of the water treatment plant you're visiting on monday
- 18. liquid is pumped into the ocean or used in irrigation of crops
- 19. a measure of the acidity of something
- 20. the clean water that is released from septic tanks
- 21. the passing of sewage through a sieve to remove large solids
- 22. recycled water
Down
- 1. series of underground pipes that carry water away from houses
- 2. type of water found under the ground
- 4. the chemical that strengthens teeth
- 7. rocks that allow water to soak into them
- 8. 97% of the earth's water is found in this form
- 9. process used in desalination
- 10. the process where chemicals are added that clump particles together
- 13. a sewage treatment system used at home
- 14. when oxygen is pumped into water to allow bacteria to grow
- 15. the type of rock that doesn't absorb water
- 16. water you can't drink
- 21. the stuff found at the bottom of septic tanks