Fresh tasting water is available right from the fridge and in your glass with the Pure Source Ultra water filter, which removes harmful contaminants. The Pure Source Ultra ULTRAWF has a carbon-based filter to improve your water and remove the odor and taste of chlorine. Let the filter reduce impurities found in common tap water like lead, nitrates, pesticides, and mercury. The recommended change frequency is every 3-6 months. The ULTRAWF water filter is easy to install and comes with a reminder light that is reset by pressing and holding the water filter button on the dispenser control. Frigidaire genuine filters are certified by the water quality association for sustainability and tested and certified by NSF International against NSF/ANSI Standards 42, 53 and 401. Look for the new genuine filters seal on the packaging to know your filter is authentic. Always consult your use and care guide and run water through the dispenser for 3 minutes, or 1.5 gallons, to prime the filter before use. The filter removes up to 99% of contaminants, including chlorine taste & odor, particulates Class I, cysts, lead, mercury, pesticides, insecticides, BPA, asbestos, and pharmaceuticals.