Austin Springs AS-DW-R Drinking Water Replacement Filters with Dual Cartridge Set Replacement cartridge works with the Countertop (AS-DW-CT-P) and Under Counter (AS-DW-UC) filtration systems NSF Certified to remove over 60 water contaminants including 97 percent of chlorine and chloramines (chlorine & ammonia disinfectant) in tap water Easy to install, maintain and replace - no tools required Long-lasting filters are good for up to 6 months