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The 3M 47-211212 is the correct replacement water filter for the following models of water filter systems:
The 3M CUNO Water Factory GAC Inline Water Filter is a granular activated carbon (GAC) filter that removes bad odor and taste from your drinking water associated with chlorine. This CUNO Water Factory 47-211212 carbon filter is a prolonged contact post filter. (PCF) This CUNO prolonged contact post filter replaces the CUNO Water Factory 56172-02 inline filter.
The 3M 47-211212 specifications: