Microporous Membrane Filter stainless steel water filter micropore/millipore filter folding filter cartridge high precis Technology parameterEntrance and exit connection ... so widely apply to fine filter and degerming technology. Filter element number per filter cartridge:1,3,5,7,9 ... ,11,13,15,21Folding filter element length:10,20,30, 40Filter element material: polypropylene, gather four ethylene, ...