Lasts for up to 6 months, depending on the quality of source water and daily water consumption. Dedicated 2nd stage filter replacement for iSpring RCD100 Reverse Osmosis system countertop. Easy twist-and-replace design. Featuring a multi-layer design, the 2-in-1 composite filter FPC100 removes sand, rust, dirt, particles, as well as chlorine, and unpleasant odor. Quick and easy filter change with no tools required. Backed by a 30-day money-back guarantee with lifetime support from Atlanta, GA, USA.