There are many items in a home that require regular upkeep. One that I think often gets overlooked is the water filter in the refrigerator. This filter not only improves the taste of your water and ice, it also removes impurities from the water. Let’s talk about when the filter needs to be replaced. I’m going to use my refrigerator as an example, filter 4392857 replacement should occur 1) every 6 months, or 2) when the filter change indicator light comes on, or 3) if the refrigerator has been off for longer than 2 weeks, or 4) decrease in water flow or bad taste/odor.