Adding an Aerator on the end of your faucet will add air to your water flow. Mixing air into the flow of water produces a steadier, more stable stream. An aerator is usually a simple, mesh screen made of metal or plastic that is attached to the end of a faucet with some sort of housing. As water flows through this screen, it is divided into many small streams with air in between. This allows for the feeling of high pressure with less actual water consumption.