The Whirlpool 4373531 Ultrafine block carbon water filter replacement is used with the CoolerMATE CMRO-3TFC reverse osmosis system and the FaucetMATE FM-2 CTO and CoolerMATE CM-2 CTO filter systems.

Specifications:

• The Ultrafine 4373531 filter reduces bad taste and odor
• Reduces chlorine
• Replace every 6-12 months
• Used in FM-2, FM-350, CM-2 and SQC systems