1. wound string filter cartridge media : PP( Polypropylene), cotton; 2. length: 5 ... ; 1. micron filter length : 10'',20'', 30'',40'';2. wound string filter cartridge media: pp, cotton ;3. micron : 1um, 5um, ... b. low pressure drop, high dirt holding capacity and long service life; c. loose outer layers and tight inner ... . various filter media fit with various applications. wound string filter cartridge