Dual Gradient Density 25 / 1 micron - 20" x 4.5" * 25 micron outer layer, 1 micron inside layer sediment filter. * Reduces dirt, sand, silt, and rust particles. * 2 separate gradient density layers provide triple the dirt-holding capacity of similar sized filters. * Designed for purity with chemical and bacteria resistance * Fits Big Blue 20" x 4.5" filter housing, and Home Master Water Filter models #HMF2SdgB1, #HMF2SdgC *THIS ITEM SHIPS BY UPS GROUND AND CANNOT BE SHIPPED BY PRIORITY MAIL. |