Compared to conventional aerators, it saves about 40% of water and energy while producing a pleasantly soft and splash-free stream. The patented design mixes a lot of air into the water even at very low flow rates. Air that doesn't need to be paid for makes the water stream from the aerator pleasantly full and soft. The distinctive feature of the Long-Life aerator is the externally visible, coarse mesh screen. This unique arrangement of the screens ensures that only a small amount of water remains in the RST aerator after the tap is closed. This effectively reduces limescale buildup, unlike conventional aerators, where the slowly evaporating residual water inevitably leads to rapid and unhygienic limescale formation. Suitable for faucets with M24x1 internal thread.