backflush and plastic rotary polymer rotary filtration BACKFLUSH AND PLASTIC Our experts in the fields of backflush and plastic, polymer filtration, metallurgy and engineering have made our ROTARY IIITM Constant Pressure Drop Continuous filtration system the preferred choice among industry leaders and have made PATT Filtration a worldwide leader for customer service and satisfaction. Each of the devices mentioned above are capable of filtering polymers and each performs its job by particulate retention. Because this discussion is limited to only the most practical solutions, only the most popular, the screen filtering technique used in the backflush and plastic industry will be discussed.