A filter system with which you can refine raw water to produce gourmet water that is outstandingly suited to making hot beverages such as coffee, espresso and tea. The modular multi-stage filter uses patented BWT Magnesium Technology, which also mineralizes the filtrate with magnesium. This flavor carrier guarantees high sensory quality in both the water and the products made from it. The filter system consists of a filter cartridge with a BWT besthead filter head (see graphic) that is screwed on. The blend partial flow (0–3) is set on the filter head depending on the water hardness and requirement. Check valves in the filter head prevent backflow and uncontrolled water discharge. BWT bestmax PREMIUM food-safe filter systems are pressure-resistant and safe. They can be used worldwide in any drinking water system.