Pyrolox is a granular water filtration media used for the removal of hydrogen sulfide, iron and manganese. Through a natural chemical reaction, Pyrolox has the ability to help you produce clean, high-quality water. Pyrolox works because of a catalyst reaction whereby hydrogen sulfide, iron, and manganese are oxidized on the media. Daily backwashing then flushes trapped particulate from the filter bed. Pyrolox is a natural mineral form of manganese dioxide, making it an environmentally sound means of water filtration.