Whirlpool WF285 Refrigerator Water Filter by Whirlpool. $25.12. This Aqua Fresh filter replaces the Whirlpool 4396508 and 4396510. Filters Class I particulates down to 0.52 microns. Retains flouride in drinking water for good health. Reduces bad taste, odors, sediment, and more. Needs to be replaced every 3 to 6 months depending on water quality and usage.