中ちゅう水すい道どう

noun

gray-water system; recycled wastewater system

Technical term for a system that treats and reuses wastewater from sinks, baths, etc. for non-potable purposes like toilet flushing or irrigation.

• このビルでは中ちゅう水すい道どうを導どう入にゅうして、トイレの洗せん浄じょう水すいに