"MAXTRA+" cartridges are designed to reduce any limescale present in tap water, as well as chlorine and other impurities. The result is fresh, clean and delicious water.Using instructions:1. Preparing the Filter: Immerse cartridge in water and shake for 10 seconds.2. Insert Cartridge: Insert into the funnel.3. Fill twice and Discard: Discard the first two fillings. On the third refill you are ready to use your jug.4. Activate the Memo: Keep the memo button pressed until the four bars appear.GOOD TASTEBRITA believes that you should not compromise on taste when it comes to making delicious food and drinks that use water as a key ingredient. BRITA water filters enhance the visual appearance of tea or coffee and maintains good taste and smell by reducing limescale, chlorine and other organic impurities. The result is great-tasting water that allows the flavour and aroma of your tea or coffee to really shine through.Cartridge replacement: 4 weeks / 100 L using hard water.Convenient ring pull handle for easy exchange. 100% recyclable.