Five-layer filtration: This water-saving faucet aerator has a built-in five-layer filter, two layers more than similar products on the market, which can better filter impurities and ensure hygienic and safe water use. Suitable for kitchen and bathroom faucets. Save about 30-40% water: This economical kitchen faucet aerator can completely mix water with flowing air to form a foam effect, improve cleaning power and thus reduce water consumption. Faucets equipped with aerators save about 30-40% water compared to faucets without aerators. Splash-proof soundproof constant flow: After mixing with air, the water flow becomes smoother, which reduces the impact force and prevents water droplets from splashing. Therefore, the sink faucet can also play a good constant flow and noise reduction effect. Good sealing: There is a tight sealing ring on the outside of the faucet aerator nozzle to prevent water from splashing sideways. At the same time, 2 plug-in keys are included in the package. You only need to tighten the faucet aerator with a key and the entire installation process is very convenient. Package list: You will receive 6 faucet aerators and a key. Depending on the water quality in your area, for the hygiene and safety of your water, it is recommended to replace the aerator every 3-6 months.