The RST aerator "Long-Life" saves approximately 40% water and energy compared to conventional aerators, while producing a pleasantly soft and splash-free stream. Thanks to its patented design, a significant amount of air is mixed with 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 "Long-Life" DS aerator can only be disassembled with the included special key due to its endlessly rotating outer sleeve. It is suitable for faucets with an M22x1 external thread. The distinctive feature of the "Long-Life" aerator is the coarsely meshed sieve lens that is visible from the outside. This unique arrangement of the sieves ensures that only a small amount of water remains in the RST aerator after the faucet is turned off. This effectively reduces limescale buildup, unlike conventional aerators, where the slowly evaporating residual water inevitably leads to rapid and unhygienic limescale formation.