очистка; очищение; ректификация - chemical purification - final purification - mechanical purification - natural purification - primary purification - purification of sewage - sewage purification - swimming-pool water purification - water purification
PURIFICATION
Англо-русский перевод PURIFICATION
Быков В.В., Поздняков А.А.. English-Russian dictionary of construction and new building technologies. Англо-Русский словарь по строительству и новым строительным технологиям. 2003