Treating Drinking Water

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Across
  1. 2. the step that clumps gather up in water
  2. 3. chlorine is added to kill remaining organisms
  3. 5. the start of the cycle
  4. 6. adding sodium or lime to finish off the process
Down
  1. 1. the process of forming clumps in a liquid
  2. 2. when water trickles down sand or gravel
  3. 4. forcing air through the water