Specifications include, but are not limited to: Furnish, install and place in operation, an iron removal system based on product by Hellenbrand. Model: H125-IC 13 Twin Iron Curtain System or DNR Project Manager pre-approved manufacturer prior to bid opening. FILTER TANKS: Two 13”x 54” diameter Composite non-corrosive tank with 2.5” top opening. NSF listed, 150 psi w.p. Side openings and/or steel tanks are not allowed. FILTER MEDIA: Iron Curtain ™ multi-media mix filter bed. FILTER CONTROLS: (2) The main operating control valve shall have a 1.25” inlet/outlet connection, top-mounted design with a 12-volt electronic microprocessor controller, relay driver, and electronic meter that is built into the control valve. Mechanical meters not acceptable. Control shall be capable of providing the complete regeneration sequence of backwash, fast rinse and return to service. Control valve shall be made of non-corrosive materials, including all wetted parts. NO RAW WATER BYPASS: Each filter shall be furnished with an external Motorized Auxiliary Valve for the purpose of preventing unfiltered water to bypass to service during regeneration. The Auxiliary Valve shall be constructed of non-corrosive materials, including all wetted parts. AERATION TANK: 18”x 65” diameter fiberglass non-corrosive tank with a 4”-8 top opening. NSF listed 150 psi w.p. as manufacture. Side openings and/or steel tanks are not allowed. The tank shall be designed to allow for a top 1.25” inlet and outlet feed.