Precision-engineered with advanced Triple Filtration Technology, Filter 4 is rigorously tested to leading standards for contaminant reduction and certified* to reduce 32 potentially harmful contaminants, like heavy metals, pesticides and 99% of microplastics. This genuine everydrop® water filter is developed in lockstep with your refrigerator to set the standard for crisp, clean and refreshing water.Be sure to check for compatibility with your refrigerator prior to ordering. Commonly compatible refrigerators include but are not limited to: WRX735SDHZ, WRF535SWHZ, WRF555SDFZ, KRFC300ESS, WRX735SDBM, MFI2570FEZ, WRB329DMBM, KRFC302ESS, WRF540CWHZ, KRFF305ESS, WRF555SDHV, WRF535SWHV, MFI2269FRZ, KRFF302ESS, WRX735SDHV, MFI2269DRM, WRF550CDHZ, WRF540CWBM, AFI2539ERM, MFC2062FEZ, WRF535SWHW, WRF535SWHB, KRFC300EBS, JFC2290REM, GI0FSAXVY*Filters certified by NSF International under NSF/ANSI Standards 42, 53, and 401 to reduce specific contaminants. See everydropwater.com for details.