The Goldline 5 Stage Reverse Osmosis System comes with peace of mind. It is independently certified by the Water Quality Associations' Gold Seal Certification Program. It comes equipped with everything you need to make clean, pure, great tasting water: WQA Certified to NSF Standard 58 - Gold Seal Desal 50 gpd GE Thin Film Membrane (TFM) 5 micron GE Osmonics prefilter Two carbon block prefilters 2” x 10” granular activated carbon (GAC) post filters Supply feed valve Drain connector Auto shut off valve shuts all water off to the system when the tank is full Tank ball valve NSF 3.2 gallon storage tank NSF/Prop 65 lead free, faucet Setup is easy - everything fits together with quick connect fittings The Goldline 5 Stage Reverse Osmosis System incorporates the following steps: Stage 1ﾠ 5 Micron Sediment Filter:ﾠ Removes dirt, sediment, sand, and other physical particles. Stage 2ﾠ Carbon Block:ﾠ Reduces chemicals such as chlorine, that may be present in your water supply. Stage 3ﾠ 2ND Carbon Block: Further reduces organics, odors, and other chemicals that might be present in your water supply. Stage 4ﾠ Reverse Osmosis Membrane:ﾠ 50 gallon per day membrane removes 93-97% of dissolved mineral salts and other contaminants in the water supply. Stage 5ﾠ Post Carbon Filter:ﾠ A final polishing process that enhances and clarifies your drinking water. Contaminant reduction:Sand, silt, dirt, rust, aluminum, asbestos, chlorine, taste, odor, Cryptosporidium cysts, Giardia cysts, Lead, Dissolved minerals, Lead, Fluoride, TDS, Chromium, Barium, Cadmium, Nitrate, and Chromium (III) Nitrate.Certification: This unit is a Water Quality Association Gold Seal Certified System. The Water Quality Association (WQA) Gold Seal represents the most credible and independent testing and certification entity in the water industry. The WQA’s Gold Seal represents quality assurance through comprehensive testing and continuous research and evaluation of water treatment technologies.