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The 3M Model B1 Replacement Cartridge is designed for use in the 3M Recreational Vehicle / Marine Filtration System US-B1 and US-A1.
The B-1 should be changed every 6-8 months or 2000 Gallons depending on water quality and usage.
|B1 is used in the following Models|
3M System US-A1
3M System US-B1