Continue to enjoy cleaner and safer water from your 5-stage under sink reverse osmosis (RO) water filtration system PQC5RO by using the Vitapur VQC5ROKIT filter replacements. This kit includes NSF certified filters with a quick-connect design: one 5 micron sediment filter, two 5 micron carbon block filters and one granular activated polishing (GAC) filter. 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.