Ayro HT - Home & Travel Countertop Water Filtraion Unit: Replacement Filter Free-standing countertop filtration unit. Compact and easily attached to most standard faucets. U.S. patent pending. Advanced multi-stage filtration technology with highest grade coconut shell carbon and KDF media. Exclusive carbon-block reduces &gt;99.95% of particles 0.5 micron and larger including pathogenic bacteria. Materials and components are tested and NSF standard 42 and 61 certified. Easy-to-change replacement filter provides up to 6 months of filter life. Made in U.S.A