Product Description Three filters are included in the package. [NSF Certified performance]: The system is certified against NSF 58 for TDS reduction. Using reverse osmosis filtration technology with a filtration accuracy of 0. 0001μm, the system can effectively remove most contaminants including fluoride, TDS, limescale, and heavy metals in your tap water. System is also NSF 372 certified for lead free material [Smart, easy-to-install design]: Waterdrop RO water filtration system is an innovative, all-in-one intelligent water purification system. In just a few minutes, Waterdrop RO system can be installed completely, and in just three seconds, the filter can be changed with one single turn. Installation is that easy [The first composite filter element]: It is the first smart RO system with composite filters and tankless design in the U. S. market. The three filters provide seven stages of filtration. The pre-sediment and carbon block filter is a 3-in-1 filter that functions as that of three filters combined. The Reverse Osmosis membrane filter adopts an innovative design, and the efficiency of the filter equals more than three stages of filtration. Additionally, the activated carbon block filter uses high-precision More centralized filtration performance Effectively filters over 1000 harmful contaminant Better water purification [No-tank design]: Use new composite filter element technology to more efficiently filter out harmful substances. The tankless design helps you avoid secondary pollution and enjoy more storage space in your kitchen [No waiting for clean water]: Thanks to its internal pump, the RO system offers faster water flow (400 gallons per day). The system can filter a cup of water in about 12 seconds. It can produce pure water quickly, thereby meeting the needs of your whole family and even small companies [1: 1 low drain ratio]: Compared to traditional RO systems, Waterdrop Reverse Osmosis Water Filtration System saves water waste by 300%. Save money on your water bills while running the RO system [Special notice]: You must fully turn on the faucet and flush the RO system for 30 minutes after installation. The light on the faucet will flash blue during flushing, but once completed, the blue light will stop flashing. The total water capacity will be about 8. 5 gallons and the water will be undrinkable during flushing. To save water, be creative and collect the water for other purposes, such as watering plants NSF/ANSI 58 and NSF/ANSI 372 Certified Reverse Osmosis Filtration System NSF 58 certified NSF 372 certified Basic contaminants removal Chemical contaminants removal WD-G3-N1CFWD-G3-N3CBWD-G3-N2RO Filtration MediaPP Cotton and Carbon BlockActivated Carbon BlockReverse Osmosis Membrane Filter Life6 months or 550 gallons12 months or 1100 gallons24 months or 2200 gallons Size（ diameter x Height）3.3”*12.1”2.6”*12.1”4.3”*15” Compatible ModelWD-G3-WWD-G3-WWD-G3-W WD-G3-W WD-G2P600-W WD-G2-W Beneficial Minerals× × × Flow Rate400 GPD 600 GPD 400 GPD Pure to Drain Rate1:1 2:1 1:1 FaucetSmart faucet Ordinary faucet Ordinary faucet DisplayFilter lifespan & TDS Filter lifespan Filter lifespan Self-clean✓ × × Electricity Required✓ ✓ ✓ RO MembraneDOW TORAY TORAY Filter LifespanCF – 6 Mths, CB – 12 Mths, RO – 24 Mths CF -12 Mths, P6MRO – 24 Mths CF – 12 Mths, MRO – 24 Mths Dimensions (inch)18.06 x 5.68 x 17.76 17.32 x 5.91 x 13.9 17.32 x 5.91 x 13.9