This upgraded ro water filter system RO600ORB comes with an oil rubbed faucet, a composite water filter FCF600 and 600 GPD RO Membrane - MRO600. One 3/8'' inlet and two 1/4'' outlet quick fitting accessories are included. Depending on the source water quality and product usage, the average time span to change composite water filter FCF600 is about 12 months and for RO membrane MRO600 is 2 years. The inlet working pressure requirement for this tankless reverse osmosis system under sink is 15-60 psi. Notes: It is highly recommended to flush the tankless ro water filter system for at least 10 minutes after installation and each filter replacement and the flushing water is not drinkable. Be creative to reuse the waste water, such as cleaning the floor or watering plants.