A method of cleaning a semipermeable membrane, the semipermeable membrane being configured for carrying a fiber web, includes the steps of providing a cleaning fluid and applying the cleaning fluid on the semipermeable membrane. Further, an air press configured for carrying the semipermeable membrane...http://www.google.de/patents/US20030056919?utm_source=gb-gplus-sharePatent US20030056919 - Cleaning a semipermeable membrane in a papermaking machine
