waste water

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Across
  1. 1. what is sent to the sludge treatment?
  2. 2. what are the bad bugs called?
  3. 3. what do you squeeze out of the sludge to make it a solid?
  4. 5. what kind off door does it go through?
Down
  1. 1. how do you flush the toilet?
  2. 2. what sinks to the bottom?
  3. 4. what courses can the put the water on?