Compared to conventional aerators, it saves about 40% water and energy while producing a pleasantly soft and splash-free stream. The patented design mixes a significant amount of air into the water even at very low flow rates. Air that doesn't have to be paid for makes the water jet from the aerator pleasantly full and soft. The distinctive feature of the Long-Life aerator is the externally visible, coarse-meshed sieve lens. This unique arrangement of the screens ensures that after the faucet is turned off, only a small amount of water remains in the RST aerator. 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 M22x1 external threads.