Clean Water

1234567
Across
  1. 2. water purifiers kills________.
  2. 4. during filtration water passes through _______.
  3. 5. ________and contaminated water should be avoided.
  4. 7. Control sea water.
Down
  1. 1. who makes water safe for drinking.
  2. 3. water is _________ resource.
  3. 6. chemicals, metals and oil are ________ wastes.