This single lever mixer tap with features such as a built-in water filter, a retractable outlet and a switch for measured water flow offers a well-considered functionality. To save space, an innovative small high-performance filter with finely granulated active carbon powder is directly integrated into the outlet, meaning a separate drinking water tap and under-sink filter is no longer required. The control between filtered and mains water, as well as the water stream and spray flow functions, is conveniently located at the spout.