Guaranteed 12 month capacity. Optimize your reverse osmosis system with the VIVA21 V21RP3S06 Pre-Filter Set. This 3-stage set is specifically engineered to maximize the performance of your system by protecting and extending its lifespan. Compatible with all traditional under sink reverse osmosis systems. Designed for high performance, consistent clean and healthy drinking water. Includes: (1) 5-micron polypropylene sediment filter – removes dust, particles, and rust (2) 5-micron extruded carbon block filters – eliminate chlorine, taste, and odor