Sarjan Watertech India Pvt. Ltd. Supplies Chemical Resistance Polypropylene Filter Cartridges. Sarjan Watertech India Pvt. Ltd. Has been awarded ISO 9001:2000 certification. Chemical Resistance Polypropylene Filter Cartridges is the path breaking technology which provides longer filter life and lower pressure loss compared to string wounds, and other low end spun bonded cartridges. Chemical Resistance Polypropylene Filter Cartridges provide higher life due to higher differential pressure rating for media migration then normal low end spun filter cartridges and provide very low media migration. These are made of 100% polypropylene by spraying malted pp string on the core.