1. wound string filter cartridge media : PP( Polypropylene), cotton; 2. length: 5'', 10'', 20'', 30'', ... 40'' ; 1. micron filter length : 10'',20'', 30'',40'';2. wound ... string filter cartridge media: pp, cotton ;3. micron : 1um, 5um, 10um, 20um ...