BWT presents its unique water filter cartridge which allows you to reuse it by simply replacing the filter media inside it. This means less plastic waste per litre of filtered water than other similar water filter cartridges! With our Refill system, you can reuse yourMagnesium Mineralized Watercartridge up to four times by simply refilling it with our unique carbon granulate and Magnesium filter media. This will not only save you money, but also helps you to reduce your plastic waste.