Replacement Bosch 644845 9000194412 Ultra-Clean Refrigerator Water Filter, 1/2/3/4 Pack* When you purchase the Cunos Bosch 644845 400 Gallon Capacity OEM Water Purifier, you get clean, great-tasting water and ice. * High-quality Bosch water filters by Cuno mean you get the expertise of a world leader in liquid filtration with over 90 years of history. With this filter, you can ensure that your home or business gets high-quality water that is free of harmful contaminants like chlorine, dust, rust, and other particles, as well as unpleasant odors and tastes. *The Bosch 644845 material used in Cuno water filters is top quality, ensuring a longer product life while filtering out most impurities that can give water strange odors and tastes. *This water filter also extends the life of your refrigerator. It is designed to reduce deposits in your refrigerator's ice maker. The filtration process of water filtration treatment is that water enters from the outer surface until the water enters the middle of the filter element. As water passes through each filter layer, the filter's pores become smaller, removing even the finest particles or impurities from the water. It does not remove minerals such as fluoride that may have health benefits. The replacement intervals for these filters depend on your water quality and overall household water usage. *644845 is a replacement filter for the following refrigerators: Bosch: KAD62 series, Siemens: KA62 series, Neff: K5930 and K5920 series. *CUNO Inc. is a 3M company and the original equipment manufacturer (OEM) of Bosch water filters. They are a world leader in the design, manufacture and sale of filtration products for separating, clarifying and purifying fluids and gases. Its proprietary products are used in global medical, industrial and water markets, enabling customers to achieve greater success.