Making Potable Water

12345678910111213
Across
  1. 3. An element in group 7 that is used to kill microorganisms
  2. 7. The general term for the removal of slat from water
  3. 11. pH 7 on the pH scale - the pH of pure water
  4. 12. Water that is safe to drink
  5. 13. (2 words) The test for pure water
Down
  1. 1. Aluminium sulfate is added to clump smaller particles together which sink
  2. 2. Removal of large items from the water
  3. 4. Contains only a single substance
  4. 5. Boiling, evaporating and condensing salt water to obtain the fresh water
  5. 6. When water is passed through sand to remove small particles
  6. 8. Larger particles of mud sink and settle out of the water
  7. 9. (2 words) Using pressure to push water molecules through a membrane leaving the salt behind
  8. 10. When microorganisms e.g. bacteria are killed