This is a two pack of Brita Bottle Replacement Filters Brita 35561 used with Brita Bottle water purifiers including the Brita Blue Bottle 35558 and the Brita Green Bottle 35559. Using this Brita Bottle filter element with the Brita Bottle Water Filtration System eliminates the need to buy costly bottled water by allowing you to purify tap water. Brita Bottle filter element primarily reduces the bad taste and odor of chlorine though it will also reduce other commonimpurities and particulatessuch as sediment dirt sand silt rust limescale and more. Each filter will last for approximately 150 bottle refills.01/01/2011headerFilter Cartridge 30 Days