Determine the required flow and actual delivery head first. Then distinguish between a complete ProFlow pump and the matching sf rapid-filter cartridge.
JBL ProFlow pumps move water in aquariums and connected systems. This category includes several ProFlow t and ProFlow u models as well as a ProFlow sf rapid-filter cartridge. The correct version depends on the required flow and installation conditions.
Compare aquarium size, desired circulation, delivery head, available connections and the permitted field of use. Hoses, height differences and connected equipment affect the flow that is actually available at the outlet, so the model number alone does not describe every installation.
The rapid-filter cartridge is an accessory rather than a complete pump. Check that it matches the existing ProFlow model. Clean the intake and impeller in accordance with JBL's instructions to maintain performance and quiet operation.