The Kubota membrane separation device is a membrane separation equipment. The membrane material is chlorinated polyvinyl chloride, which belongs to microfiltration membrane (with an average nominal pore size of 0.2 μ m). Its compact size enables high-purity water treatment, making it widely used in fields such as purification tanks (integrated wastewater treatment equipment) and industrial and domestic wastewater treatment. The membrane separation system not only removes suspended solids, but also Escherichia coli, so the treated water can be directly reused. Easy maintenance is also one of its major advantages, as water treatment equipment and facilities can be managed by only a small team of employees. In 1998, Kubota provided a system for a sewage treatment project in the UK, expanding the market beyond Japan. Kubota continues to provide submerged membrane separation systems for domestic and industrial wastewater treatment projects in markets primarily in Europe and North America; In 2001, Kubota entered the Chinese market and was adopted and successfully operated in sewage treatment plants with a scale of tens of thousands of tons in China. Kubota will strive to expand its market to other countries and regions, including the Middle East, India, and Southeast Asia. So far, Kubota has provided systems to approximately 981 projects outside of Japan. Currently, Kubota ranks among the top performers in terms of performance in membrane separation system projects.