Buildings such as hotels, motels, and multi-family apartments whose owners and operators pay for large volumes of water can benefit greatly from this simple technology. Low-flow water fixtures are retrofits that can be done to faucets, toilets, and showers by making them use less water for a given task. Low-flow aerators and showerheads do this by restricting the flow of water through smaller apertures increasing the pressure felt by the user but reducing the water consumed for a given task. Low-flow retrofits are often some of the quickest paybacks seen on energy and water efficiency projects.