The lifespan of a filter membrane can vary depending on several factors, including the quality of the membrane material, the operating conditions of the filtration process, and the nature of the material being filtered. In general, filter membranes can last anywhere from a few months to several years, depending on the specific application and the level of filtration required. Some factors that can affect the lifespan of a filter membrane include fouling, chemical exposure, operating conditions and cleaning & maintenance.