ICE DADDY 2-Packs of WF3CB Replacement Refrigerator Water Filters WF3CB Removes harmful chemicals and additives that occur in tap water. This WF3CB filter is a perfect alternative to the original filter. Your satisfaction is paramount to us, which is why we prioritize your happiness and satisfaction. Recommended to replace the filter every 6 months or 300 gallons. No tools is required. Simply pop up the filter and pop in the new one every 3 to 6 months depending on usage.