廃水
  はいすい
  noun (common) (futsuumeishi)
  wastewater
  waste water
  liquid waste
  black water
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  排水
  はいすい
  noun (common) (futsuumeishi)
  noun or participle which takes the aux. verb suru
  drainage
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  配水
  はいすい
  noun (common) (futsuumeishi)
  noun or participle which takes the aux. verb suru
  water supply
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