About This 2 x 1st stage: 5-micron multi-layer gradient polypropylene snow-white filter blocks sediment, sand, dust, rust and anything that causes turbidity 2 x 2nd stage: 5-micron granular activated carbon absorbs unpleasant chlorine, tastes and odors, cloudiness and colors 2 x 3rd stage: 5 micron CTO carbon block absorbs any residual chlorine, tastes and odors, plus compounding pre-filters' efficiency and extending RO membrane's life 1 x 5th stage: total polishing inline carbon absorbs any possible residual tastes and odors Individually wrapped for freshness Overview Material : Carbon,Activated Carbon,Polypropylene Product Dimensions : 2.5"D x 2.5"W x 10"H External Testing Certification : No Product Benefits : Improves water quality and taste by removing sediment, absorbing impurities, and polishing residual tastes/odors. Improves water quality and taste by removing sediment, absorbing impurities, and polishing residual tastes/odors. Brand : PureDrop