Bosch Refrigerator Water Filter EVOLFLTR10 by CunoOCS (3-Pack) This filter replaces the Whirlpool WHKFR-PLUS / WHKF R-PLUSfilters. The Bosch Refrigerator Water Filter EVOLFLTR10 by CunoOCS fits refrigerators using the Sanitary Quick Change filter system. Bosch Refrigerator EVOLFLTR10 by CunoOCS replaces the following filters: 1257074 55866-05 55866-06 640565 AP3961137 B20CS5 B20CS8 CS-450 CS-451 CS-51 CS-52 EVOLFLTR10 Note: The EVOLFLTR10 capacity is 400 gallons verses the Cuno CS-52/CS-51 capacity of 1500 gallons. The EVOLFLTR10 reduces the following contaminants: 86.00% of Chlorine 92.00% of Particulates (Class I) Filter change instructions: Bosch Refrigerator Water Filter EVOLFLTR10 by CunoOCS should be replaced every 6 months or when the "change filter" light comes on - whichever comes first. Installing your new water filter: Disconnect the refrigerator water supply and unplug the refrigerator Push the button at the top of the filter case and remove the case from the compartment Twist the old filter a quarter-turn counterclockwise Pull the filter straight out and discard Remove the protective cap from the new filter Push the new filter into the fridge until it stops Twist the new filter a quarter-turn clockwise Replace the filter case back into the compartment Reconnect the refrigerator water supply and plug the refrigerator back in