Air Injection System the Terminator. An air injection system for H2S odor andor iron problems using a 1.5 cuft 10" x 54" mixed bed filter with a Fleck 5600, 1.05" distributor tube, gravel underbed and a 1" stainless steel by-pass valve. The air mixing tank is a 7" x 44" polyglass tank with 3/4" inoutlets, a 1/8" float controlled Honeywell air vent valve and a 1" Waterite brass venturi (3.8-16 gpm). Not recommended if you have a jet pump. Free Shipping. $762.51