Pentek PCF1-20MB Water Deionization Filter Cartridge, 20" x 2-1/2" Demineralizes water for medical, pharmaceutical, cosmetic, and circuit board manufacturing applications Mixed bed moist spherical bead deionization resin with polypropylene pre- and post-filters Capacity of 600 grains Initial pressure drop of 3.4 psi at a recommended flow rate of 0.50 gpm Temperature range of 40 to 100 degrees F (4.4 to 37.8 degrees C)