Alamo Brand (A8033) Filox for Iron, Hydrogen Sulfide and Manganese Removal 0.5 CF High performance media for iron, hydrogen sulfide, and manganese removal. Filox out performs traditional media such as Birm and Greensand. Highest flow rate of any standard iron removal media, 6 gpm/cu.ft service flow; 12-15 gpm/sq.ft backwash rate.