Drinking water that has been filtered is not only healthier, but it tastes better too. The 4396710 filter takes your tap water and passes it through activated carbon, which traps many contaminants and particles. The filter then passes on the filtered water to either be drank or turned into ice. For replacement filters, we offer the Whirlpool PUR Advanced refrigerator filter which is made of OEM parts. The Whirlpool PUR filter has also been tested and certified to meet NSF Standard 42 and Standard 53. This means that it has been certified to reduce chlorine levels and remove many of the impurities in tap water. The 4396710 filter has a filtration capacity of 200 gallons and a water flow rate of a half gallon per minute. We suggest changing the filter at least once every six months to ensure your water remains as clean and healthy as it can be.