20" Big Blue Whole House Water Filter GAC Carbon with CLEAR BLUE TRANSPARENT HOUSING Replacement filter package for this system is Amazon item B01F0BWT7A 1" Brass Inlet / Outlet With Clear Housing Excellent to remove Chlorine, Odors and many other chemicals and contaminants. Heavy-duty construction and large capacity for high flow applications. Complete Systems with Filter Cartridge, Wall Bracket and Housing Wrench.