S & C Invotek supplies Heavy Duty Surface Filter Bag. S & C Invotek manufactures a wide range of filtration products for Engineering and Process Industries like Bag Filters, membrane cartridge filters, Vent filters and Steam filters. The Heavy Duty Surface Filter Bag is used for heavy dirt load application and provides a larger surface area compared to other filter bags. The Surface Filter Bag increases the amount of contaminant held and extend the time between change-out.