These Aires Filterworks AF-Series filter cartridges are designed to fit standard 10- or 20-inch point-of-use and point-of-entry housings, utilizing a wide variety of medias that eliminate harmful contaminants and improve drinking water. Housings are injection molded and made of high-grade materials. Cartridges are certified with the WQA Gold Seal, ensuring you receive the highest quality products that meet the strictest manufacturing standards. The WQA Gold Seal program assures that cartridge materials and construction are tested and certified to meet NSF/ANSI certification standards. Choose from a wide range of filter cartridge options depending on the specific contaminants you need to eliminate. This nitrate removal cartridge utilizes high capacity SIR-100-HP media. This media can remove nitrates preferentially in the presence of sulfates and other divalent ions. The nitrate selective media features uniform particle size, low-pressure drop, and has good physically stability. Eliminate harmful contaminants and improve drinking water Higher capacities maximize media fill and extend cartridge life Designed to fit point-of-use and point-of-entry housings Ensure quality control of each cartridge with complete traceability Efficiently remove nitrate from water and eliminate the possibility of nitrate dumping upon exaustion. Maximum capacity of 475 grains. Service flow rate of 0.1 GPM