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The 3M Model C Replacement Cartridge is designed for use in the 3M Recreational Vehicle / Marine Filtration System USF-C, USFC and USF-A, USFA. Part number 5614506.
The 3M Model C is also NSF/ANSI Standard 53 Tested to reduce:
The C should be changed every 6 months or 500 Gallons depending on water quality and usage.