Hunan Keensen Technology Co., Ltd., established in 2008, located in high-tech development district, Changsha (Lu Valley · Hunan· China), specializing in R&D, production, sales and service for reverse osmosis and nanofiltration membrane elements. Keensen introduced the top technology and automatic membrane sheet and element production line from USA in 2010. It has the annual output capability of six million square meters membrane sheet. Keensen has made significant breakthrough in material formulation, processing skills, testing and products application by keeping introducing, digesting, absorbing and innovating in the past six years, including RO and NF membranes, hundreds of membrane flat sheets and elements. Moreover, OEM or ODM orders were acceptable. Keensen membranes have been widely applied in the drinking water, sewage, seawater, brackish water treatment, and material concentration and separation, and enjoyed many customers in steel industry, electricity, civil engineering, medicine, food and beverage, hospital both in the domestic and overseas market.