Dissolved elements in your tap water can corrode your coffeemaker's internal plastic and metal components; removing these residues with a charcoal filter will help extend the lifespan of your coffee machine. Charcoal filters remove impurities for great-tasting coffee every morning: The quality of the water you put in your coffee machine directly impacts the quality of your morning brew. This premium charcoal water filters feature ultra fine grain organic charcoal in a micromesh pouch for maximum filtration. Universal design is compatible with drip coffee makers and the 12-pack of replacement cartridges lasts up to 1 year