Qingdao Guolin Environmental Technology Co Ltd (青岛国林环保科技股份有限公司) was founded in 1994. It is a high-tech company focusing on advanced ozone technology and is ranked as a leading ozone supplier with a large production scale in Asia.

Guolin is mainly engaged in the research of ozone generation mechanisms, ozone equipment design and manufacturing, ozone application project design, installation, debugging, and professional operation maintenance.

The company has also successfully expanded to industries along the ozone technology industrial chain, such as piezoelectric ceramic and glyoxalic acid monohydrate.