CRYSTAL QUEST Portable 3-stage Reverse Osmosis System provides safe, pure, high quality drinking water with capacity of up to 50 gallons per day using Reverse Osmosis technology. It is great for homes, apartments, office, recreational vehicles, motels, and laboratory use. Water goes through 3 stages of filtration. In stage 1: Water travels through a sediment filter cartridge that removes 99.99% of microbiological cysts, cryptosporidium and giardia, In stage 2: Water passes through granular activated carbon (GAC) cartridge. GAC is universally recognized and widely used as an effective adsorbent for a wide variety of organic contaminants, such as chlorine (99.9%), chemicals linked to cancer (THMs, benzine), pesticides, herbicides, insecticides, volatile organic compounds (VOCs), PCBs, MTBEs and hundreds of other chemical contaminants that may be present in water that cause bad taste and odors in your drinking water. In stage 3: Water travel through 50 GPD TFC Reverse Osmosis membrane which removes lead, sodium, cyanide, ammonium, mercury, bromide, cadmium, trivalent chromium, radium, magnesium, fluoride, nitrates, nitrites and more. CRYSTAL QUEST Countertop Reverse Osmosis Water Filter System is convenient, easy to use and hook up to the sink faucet. It features an output of 50 gallons per day (76 liters per day). All the hardware is included.