Water Quality Controller

Korea Rural Community Corporation, Rural Development Administration, Kyung-In Trading Co., Ltd. (Domestic branches, Turkey plant, China plant), NtoB (POSCO, Sae-il Paper), Korea Bunter, Korea Microworks, Seongnam City Hall, Seoul Seongdong District Office, Hanam City Hall, Hwacheon County Office, Korea University Anam Hospital Water Treatment Plant, Korea University Ansan Hospital Water Treatment Plant, Sunaltech Co., Ltd., Korea Moonsan, Celltrion Inc., Celltrion Pharm Inc., Samwon Industry Co., Ltd., Haitai Beverage Cheonan Plant, Korea Water Resources Corporation (K-water), Incheon International Airport, HanDo I&C Co., Ltd. (Seoul branch & Busan headquarters), Seogeum Aqua Co., Ltd., Hongkyung Engineering, MoaSoo Co., Ltd., Hongik Control Co., Ltd., Chunse Industry, Seoh Co., Ltd., Guri City Sports Association, Gunpo City Facilities Management Corporation, Giheung Plant Co., Ltd., Taepyeong Brewery, Daemyung Teijen Industry, Jongno District Office, Noblesse Tower, Duri Environment Co., Ltd., Incheon Steel, Hanchi E&C Co., Ltd., Borak Co., Ltd., Samsung Medical Center, Seoul International School, Sebang Chemical Industry Co., Ltd., Soonchunhyang University Hospital, Shinmyeong Myungsom Cooperative, Shinhan Construction Co., Ltd., Luven Co., Ltd., Stec Co., Ltd., Cheoncheon Environmental Technology Co., Ltd., Ildong Pharmaceutical, eBioGen Co., Ltd., Jetec System, Pocheon City Hall, Pulmuone Health & Living Co., Ltd., Korea Railroad Corporation (KORAIL), Hanam Urban Development Corporation, Hongcheon County Office, Yangyang County Office (Swimming Pool), Sejong SK Biopharm, and many others (partial list).