The BOANN 1 year filter pack includes 2 each of the following filters. The Sediment Pre-Filter GAC Pre-Filter and Carbon Pre-Filter. Altogether these filters remove particles carbon compounds to improve your water quality to safe drinkable standards and even removes the bad chlorine odor and taste from your water. 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!