Enpurion Metals Treatment (MT) FlexBasin Media Pillow, Natural Fiber - Organically grown activated cellulose, engineered for cationic exchange for heavy metals, effective on Zn, Cu, Pb, and turbidity. Also on oils and phosphorus. Suitable for downspout units and catch basin inserts, also can be used in above ground systems. Available in 1 cubic foot pillows 1-3 units per CBI.