We use activated Carbon Media just like everyone else. Our filters are third party tested to NSF 42 Standards and effectively reduce chlorine, bad taste, and odors. Sorry Euro Filter company who's names our lawyers said we can't use, the days of fleecing people on price are over. We provide great filters at a fraction of the price, we are a whole lot more convenient and we help raise money for charity with the savings. This is a no brainier.