Apex Premium Carbon Filter Cartridge NSF approved, acid washed, high performance coconut shell activated carbon. Reduces fine sediment and chlorine taste and odor in residential and commercial drinking water High chemical absorption capacity. Fits all APEX countertop and reverse osmosis systems and most other standard sized RO systems, countertop filters and countless other commercial and residential water filter systems. Compliance with Prop: 65 Temperature range of 40 to 180 F (4.4 to 82.2 C) 5 micron Carbon Block Filter Cartridge is made from Coconut Shell Carbon, which creates, what many believe to be a sweeter tasting water. This unique pore structure of this carbon, is well suited for chemicals absorption, including VOCs, while reducing chlorine and chemicals that contribute to taste and odor. 5 micron carbon block filters provide 5 micron particulate filtration and extended life as a fine sediment filter. The service life of a carbon block filter is greatly extended by an outer layer of 5 micron prefiltration medium and will operate effectively in most installations with out prefiltration. This filter is ideal for residential and food service applications where improving the quality of the water is the primary objective. The manufacturing process of the Carbon Block Filter use prewashed Activated Carbon powder with high CTC to obtain maximum performance and better taste. Fits most standard RO systems and countertop systems.