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The 3M Cuno 9.75 is the correct replacement filter for the following water filtration systems:
The Cuno 9.75" Post Treatment Cartridge for B-Assembly is a replacement water filter cartridge for the 3M Cuno CFSRO1200 reverse osmosis water filtration system. This TDS Adjustment Post-Treatment filter helps your reverse osmosis filtration operate at peak capcity and is built for high TDS conditions up to 2,000 ppm TDS. This 9.75 inch filter is also known by part number 55911-01.
Cuno 9.75" Post Treatment Cartridge for B-Assembly specifications: