A faucet aerator is a small and inexpensive device that easily fits on most modern indoor faucets and reduces your home water consumption. Some aerators possess screens, but not all. If your tap water is sediment rich, it's possible that the screen may become clogged eventually. The aerator works by mixing air with the faucet water and spreading the stream of water out. Most aerators will still give you a single stream of water from the faucet but some will spread it out through a array of smaller holes. It's likely that you won't be able to detect a change in your faucet water pressure with a single stream aerator and, once installed, the aerator is hardly noticeable.
A faucet aerator is a very simple way to green your home. One average aerator costs under five dollars. You'll conserve water and even see savings on your utility bills.