For point of use applicationsEPA Est. Number 082989-CHN-001Excellent bad taste, odor, and chlorine taste & odor reduction as tested by American Plumber Available in a wide range of sizes to fit both Standard and Heavy Duty filter housings Specialty blocks are capable of reducing cysts, lead and certain volatile organic compounds (VOCs) as tested by American Plumber NSF/ANSI Standard 53 certified to reduce cysts such as Cryptosporidium and Giardia by mechanical means Reduces particles as small as 0.5 micron in size by mechanical means (Price subject to change without notice. Check stock before order)