W.5CB American Plumber Carbon Block/Lead Reduction Drinking Water Filter CartridgesFor point of use applicationsEPA Est. Number 082989-CHN-001Excellent bad taste, odor, and chlorine taste & odor reduction as tested by American PlumberAvailable in a wide range of sizes to fit both Standard and Heavy Duty filter housingsSpecialty blocks are capable of reducing cysts, lead and certain volatile organic compounds (VOCs) as tested by American PlumberNSF/ANSI Standard 53 certified to reduce cysts such as Cryptosporidium and Giardia by mechanical meansReduces particles as small as 0.5 micron in size by mechanical means