Compatible with all BRITA Jugs including those with 'PerfectFit' Feature (Aluna, Marella, Style),Micro Carbon Pearls Reduce Chlorine and Impurities for Improved Taste and Appearance of Food and Drinks,Ion Exchange Pearls Permanently Absorb Lead and Copper and Reduce Limescale, for Appliance Protection,Recommended by the UK Tea Academy and by Consumers - 96 Percent Agree Tea is more Brilliant with MAXTRA+ Filtered Water,Fresh Great Tasting Water, without the Waste of Bottled Water for just a few Pence per Litre.MAXTRA+ Filter Cartridges Last Approximately 4 Weeks and are Recyclable.Packing may vary