Enjoy cleaner, refreshing water from your Vitapur® under sink PQC4RO reverse osmosis (RO) water filtration system by using the Vitapur VQC4ROKIT filter replacements. This kit includes NSF certified filters with a quick-connect design: one 5 micron sediment filter and two 5 micron carbon block filters. Together, these filters reduce particulates such as sand, rust and dirt, as well as reduce unwanted contaminants and chemicals, including chlorine, lead, TDS and heavy metals. Replace these filters every 6 months to maintain optimal filtration performance.