Pyrolox® Pro 18x44, 25 Kg, 1/2 cuft WashedPyrolox is a naturally sourced mineral rich in manganese dioxide, designed to eliminate iron, manganese, and hydrogen sulfide from water. This granular media serves as a catalyst, triggering the oxidation of these contaminants upon contact. In certain situations, a preliminary treatment using air, chlorine, or potassium permanganate may be advisable to enhance effectiveness.