Purigen

No other filtration media removes impurities at a rate this high! Purigen removes impurities at a rate and capacity that exceeds all others, by over 500%! Take care of proteins, nitrites, nitrates, ammonia, as well as a variety of organics without impacting valuable trace elements. Let Purigen polish your water to a cleanliness you will not believe. Amazingly, once Purigen is exhausted, you can actually renew it with household bleach!