●High dirt-holding capacity for critical applications such as corrosive fluids, including acids, alkalis, oils, organic solvents, and microorganisms ●BP Series filters are made with high quality glazed PP felt filter media ●Offered in actual sizes of 4" D x 8.625" L or 4" D x 18" L to fit any standard 10” or 20” filter housings ●Available in the nominal micron ratings of 1, 5, 10, 25, 50, 100, and 200 microns ●SpiroPure filter bags have a 30-Day money back guarantee