Aerated Faucet are designed to mix air into the water stream. This maintains steady pressure so the flow has an even, full shower spray.
If an aerator is already installed on your faucet, it will have its rated flow imprinted on the side. This should read 2.75 gpm (gallons per minute) or lower. Replace if over 2.75gpm. If no aerator is installed, check to see if there are threads just inside the tip of the faucet. Most modern faucets are threaded to accept aerators. Cost: Low-flow faucet aerators usually cost $5 -$10
About half the hot water consumed in a typical household is used while bathing, and another 7 to 14 percent is used in the sink. By reducing the flow of water coming from your faucets can generate significant water / sewer and energy savings at very low costs and with easy installation.
The average faucet has a flow rate of about 3 to 5 GPM. Adding a screw-in faucet aerator reduces the flow to 0.5 to 1.5 GPM in the bathroom and 2.2 GPM in the kitchen. In addition to saving energy and water, the “foamier” water that comes from faucet aerators wets objects better than water from a faucet with no aerator, which tends to bounce off the object rather than thoroughly wetting it.