Water Treatment

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