Under The Sink Five Stages Filtration Drinking System Features: Capacity: 1 gpm Purpose: For the removal of particles and clorine taste and odor from water. Application: Laboratory use Drinking and cooking purpose Other application requiring filtered quality of water Process of Filtration and Treatment System: 1st stages: 5micron sediment filter that removes solid particles from the water. (Diameter of 1 hair strand = 75 Micron) 2nd stages: Granular Activated Carbon Filter eliminates unpleasant taste and odors caused by chlorine and organic contaminants. 3rd stages:Polishing Carbon Filter that makes the water crystal clear shiny. 4th stages:Thin Film filter remove heavy metals and small size of particles such as rust, silt and has filtration capacity of 0.1 micron 5th stages:Carbon post filter enhances the taste of treated water. CE certified NSF certified USA Technology Note: Optional Ultraviolet Light