Function International Public Company Limited, together with its subsidiaries, engages in manufacture and sale of water treatment products in Thailand and internationally. It offers household water purifiers, water purifier RO systems, and filters; commercial water purifiers, water dispensers, water vending machines, and watermakers; industrial TRT and tank and media; and pumps and valves. The company sells its products under the Aquatek Silver, Treatton, WACO, Unipure, Unipure Green, Unipure Blue, Hydro Max, Star Pure, Fast Pure, BIO MAX, Dosag Pump, Ultratek, CNP, HP Watermaker, PENTAIR, RUN-XIN, SUEZ, and VONTRON brands. It also rents factories and duty-free zones. Function International Public Company Limited was founded in 1997 and is based in Khlong Sam Wa, Thailand.