MAXTRA + UNIVERSAL FILTER AT AN UNBEATABLE PRICE. The enhanced MAXTRA + filter contains microgranules of activated carbon of natural origin and ionic exchange granules; Activated carbon microgranules reduce chlorine, improving the taste of tap water; Ion exchange granules reduce limescale and metals, such as lead and copper. Limescale reduction helps protect household appliances, such as the coffee machine, from the formation of deposits;