The BWT Bestmax Premium XL filter cartridge – capacity: up to 5160 liters.* The Cartridges with “AromaPLUS” aromatic formula provide an innovative filtering system of water optimization for catering. They reduce limescale build-up and total hardness of drinking water and at the same time they protect devices used in catering, eg. coffee machines, espresso machines, vending machines for hot and cold drink, steam cookers, combination ovens or ice makers against limescale build-up. They also improve the taste and flavour of beverages as they remove flavours and aromatic substances such as chlorine. Additionally, they filter water contaminants.