BOANN RO-6MPK 6 Month Filter Pack for RO Water Filtration System 100% Polypropylene (Stage 1) & 100% Coconut Base Carbon (Stages 2-3) Certified Material Particle Removal - Dirt, Sediment, Rust & Other Particles (Stage 1) Removes Volatile Organic Carbon Compounds (Stages 2-3) Improves Water Purity, Removes Chlorine Taste & Odor (Stages 1-3) Quick-Twist Filter Replacement - No Tool Required! FOR BOANN SYSTEM ONLY!