BOANN RO-1YPK-C 1 Year Filter Full Filter Set with Stages 1/2/3/5 for BNROSYS and BNRO6SYS 100% Polyproylene (Stage 1) & 100% Coconut Base Carbon (Stages 2-3+5) Certified Material Particle Removal - Dirt, Sediment, Rust & Other Particles (Stages 1+5) Removes Volatile Organic Carbon Compounds (Stages 2-3+5) Improves Water Purity, Removes Chlorine Taste & Odor (Stages 1-3+5) Includes 2 Sets of Stages 1 thru 3 (6 Months each set) and 1 Stage 5 (1 Year) Filters