Cellulose membranes are mainly made of cellulose acetate and were widely used in reverse osmosis systems in the early days. Cellulose membranes have good chlorine resistance, but poor stability under high temperature and low pH environments.

The types of ultrafiltration devices are: 1. Organic membrane ultrafiltration device， 2. Inorganic membrane ultrafiltration device， 3. Hollow fiber membrane ultrafiltration device， 4. Flat membrane ultrafiltration device， 5. Roll membrane ultrafiltration device， 6. Intermittent ultrafiltration...

Hollow fiber membrane is a porous membrane with a honeycomb-like structure. This membrane is composed of a series of fine hollow fibers with a pore size at the nanometer level. It is usually able to filter out particles such as bacteria, viruses, suspended solids and organic matter in the water, thereby achieving water purification and filtration.