Sewage is:
- a. Wastewater with impurities
- b. Only pure drinking water
- c. Only forest rain only
- d. Only distilled water only
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Sewage may contain:
- a. Only pure gold always
- b. Pathogens
- c. Only pure oxygen only
- d. Only nitrogen crystals only
First step often:
- a. Only tasting sewage
- b. Screening
- c. Only adding pure oil
- d. Only ignoring solids
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