Reduce the chlorine taste and odor in your water with the Brio stage-2 pre-carbon granular activated carbon replacement water filter, which is compatible with Brio water-cooler model CLPOURO420SCV2 and old version clpourosc420ro. The second filter is a 4-stage filtration system, the stage-2 water filter is specifically designed to improve the taste and appearance of water, as well as capture small particulate matter and contaminants, maximizing the efficiency of the stage-3 reverse osmosis membrane. The stage-2 filter is a granular activated carbon filter and is both food-grade and B.P.A. free. The granular activated carbon, itself, is made from raw coconut shells, which are naturally high in carbon. The shells are ground up and heated to increase or activate the surface area of the carbon. The number of tiny pores on each granule increases exponentially during the heating process. And the more pores there are, the more places there are for tiny particulates to get adsorbed or trapped. An essential component to a water filtration system, the Brio stage-2 granular activated carbon pre-carbon filter will protect your entire filtration system and leave your water looking great and tasting even better.