Water

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Across
  1. 4. chlorine is added to destroy any bacteria, and in some community's fluorine is added
Down
  1. 1. impurities are allowed to settle to the bottom of a settling tank
  2. 2. alum is added to the water that produces sticky particles in which dirt and other particles cling to
  3. 3. passed through a filter tank where other impurities remaining are filtered out through
  4. 5. water being sprayed into the air where it mixes with the oxygen