Replacing your commercial reverse osomsis membranes can be costly An often overlooked alternative is cleaning your existing membranes. Big Brand Water Filter has the capability to effectively clean both 4" and 8" diameter RO membranes in our facility. Each membrane is pre and post tested to ensure cleaning effectiveness. They are then returned to the customer, packaged in new boxes and bags. This service is valuable for those customers who do not have cleaning equipment on site, do not have adequate equipment, are subject to severe discharge restrictions, do not have the personnel or time to clean, or who simply prefer the convenience of having membranes cleaned off-site.