This system includes: Fleck 5600SXT Digital Control valve 9x48 Fiberglass Mineral Tank 3/4"or 1" stainless steel by-pass1 Cu. ft of Multi-Media (Birm, Calcite, Filter AG, Carbon) 1 Sleeve of gravel 1.05" Riser Tube Funnel and Cap Aqua Science multiblend consists of a mix of Birm, Calcite, Filter AG, and Carbon. It's specifically designed to reduce Iron while increasing pH.