Function International Public Company Limited, together with its subsidiaries, manufactures and sells water treatment products in Thailand. It offers household water purifiers, water purifier RO systems, and filters; commercial water purifiers, hot-cool machines, water vending machines, and watermakers; industrial water purifier TRT and FRP tank and media; and pumps and valves. The company sells its products under the Aquatek, Star Pure, Hydro Max, Treatton, Unipure, Fast Pure, BIO MAX, Dosag Pump, Ultratek, CNP, HP Watermakers, Pentair, Runxin, Suez, and Vontron brands. It rents factories and duty-free zones. The company was founded in 1997 and is based in Bangkok, Thailand.