More widely used, household ultrafiltration water purifiers, ultrafiltration membranes. It can remove macromolecules, colloids, proteins, particles, etc. from the solution, and has the characteristics of low use pressure, large water production, and easy operation.

Filter membranes are used in various industries such as food and beverage, medical and pharmaceutical, municipal water treatment, industrial high purity water, boiler make-up water, seawater desalination, electronic industry ultra-pure water, wastewater treatment and reuse, material concentration and purification, and so on.

According to different mass transfer driving forces, membrane separation methods are divided into microfiltration, ultrafiltration, nanofiltration, reverse osmosis, electrodialysis, dialysis, and osmosis. The driving force for microfiltration, ultrafiltration, nanofiltration, and reverse osmosis is the pressure difference, but the magnitude of the pressure difference varies. The pressure difference required for reverse osmosis is the largest, followed by nanofiltration, ultrafiltration, and the pressure difference required is the smallest for microfiltration; The driving forces of electrodialysis, dialysis, and permeation are in order of potential difference, concentration difference, and chemical potential difference. Currently, the most commonly used membrane separation technologies in the industrial field are microfiltration, ultrafiltration, nanofiltration, reverse osmosis, and electrodialysis.

Membrane separation technology is a process that utilizes the difference in the permeation rates of components in a fluid through the membrane to achieve component separation. Depending on the selective permeability of the membrane, small molecular substances can freely pass through the semi permeable membrane. For large molecular substances, the selective membrane does not have permeability and is retained, thus achieving the purpose of separating, purifying, and concentrating substances in multiple components.