ICEPURE WFC5300A Under Sink Water Filter system, 3 Years or 22000 Gallons Ultra High Life, Replacement for ICEPURE WFS5300A Under Sink Water Filtration System, Removes Heavy Metals,Chlorine22000 Gallons Large Capacity 0. 5 Micron filter, ICEPURE Under Sink Water Filters have a large filtration capacity of 22000 gals or 3 years when used with municipal water. We recommend that you replace the filter every 3 Years for better filtration. Enjoy clean and fresh water all the time. Authoritative Certification Material Pursuing Excellent Quality. This filter bears major Authoritative Certifications on markets, such as NSF ANSI 42 from IAPMO,