Water Treatment

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