filter bed; filtration tank
Technical term for a tank or bed used in water filtration systems.
Filter beds play an important role at water purification plants.
Standard kanji spelling using 濾 (filter) and 水 (water).
Mixed kana-kanji spelling; 濾 is sometimes written in kana for simplicity.
Compound of 濾 (ろ, 'filter') + 水 (すい, 'water') + タンク ('tank').