... producted water filter cartridges by ourselves, we have PP sediment filter, PP string wound filter, Pleated filter production line, carbon block filter extruded machines, ... and testing line for RO systems.PP Sediment Filter Cartridges using 100% food grade Polypropylene (PP) as material. SPECIFICATION:OD (Outer ... Depends on Customer's requireMicron Rate: 0.5,1,5,10,25,50,75,100,150umPlease feel free ...