The Everydrop(TM) #5 refrigerator filter with advanced Triple Filtration(TM) technology further eliminates contaminants in running water based on NSF data, compared to published laboratory data for compatible filters. It thus reduces the presence of 23 contaminants, including pharmaceuticals, metals, minerals, pesticides, cysts, industrial chemicals, Class 1 particles and chlorine. Contaminants or other substances eliminated or reduced by this water filter are not necessarily found in the running water of all users. Replace the filter every 6 months to ensure clean and safe drinking water. This filter replaces previous models 4396508 and 4396510.