CJK Co., Ltd.

Founded in 2004 and based in Gyeonggi, South Korea, CJK Co. , Ltd. operates as a renewable energy company that manufactures filter system monopolized to provide water treatment services. In May 2024, CJK Co.

, Ltd. raised KRW 10 billion in series B funding from STIC Ventures, Seoul Investment Partners, Intops Investment, and Enlight Ventures. The series B funding values the company at KRW 53 billion post-money. As of February 2025, the company is led by its CEO, Kim Sang-wook.

The company specializes in water, environment, and energy solutions. With expertise in water purification, wastewater treatment, and eco-friendly technologies, CJK develops systems to address industrial and environmental challenges. The firm provides advanced solutions for PFAS removal, ultrapure water production, wastewater reuse, zero liquid discharge (ZLD), and seawater desalination, catering to industries such as food, pharmaceuticals, and hydrogen fuel cells. The company’s product portfolio includes water purification appliances, carbonated water machines, filtration systems, and industrial water treatment components.

The CJK also offers technologies such as UF/RO membranes, Liqui-Cel, CEDI, nano membranes, and FRP RO vessels, along with essential filtration and purification equipment. Its S FLUX hot and cold-water purifiers and auto strainers ensure water treatment across various applications. The organization plans to use the May 2024 funding to relocate its headquarters and research center.