Siemens Water Technologies offers a variety of filter bag replacements and housings to meet specific configurations and filtration needs. The DI GARD filter cartridge is a large void volume design for low-cost, reliable filtration performance with high contaminant holding capacity. This string wound-type filter is available in a choice of of cotton, industrial or surfactant-free polypropylene string over a polypropylene core. The cartridge's continuous filter winding in 20-, 30-, and 40-inch lengths prevents by-passing or excessive pressure drops at the seams.