This unique and patented filter fits directly into your filter jug and enriches your tap water with the precious mineral magnesium. Thanks to our patented technology, the filter cartridge is able to protect your kettle and coffee machine from the effects of limescale whilst ensuring the hardness minerals (calcium and magnesium) stay in the water. This is revolutionary! The result is water that tastes refreshing on its own and that makes fabulous, tea and coffee. A taste difference achieved by adding magnesium and reducing the amount of chlorine, lime and heavy metals where present in your own tap water. Tested by the University of Milan Magnesium-more taste technology Cost-reducing plastic Perfectly compatible with Brita Maxtra Jug More life to household appliances - less limescale