Dictionary/浄化槽じょうかそうJoukasou浄化槽 (Joukasou) is a Japanese noun meaning “water-purification tank, septic tank”.Meaningsnounwater-purification tanknounseptic tankKanji in 浄化槽浄clean化change槽vatRelated words船ship同化assimilation軟化softening変化change老化ageing清いclean酸化oxidation悪化deterioration化け物goblin文化culture進化evolution化粧make-up