The Roberts’ GEMINI^® Carbon contactor successfully meets the challenges of granular activated carbon (GAC) treatment and offers excellent contaminant removal, reliable operation, and simplified maintenance.

The patented GEMINI system eliminates the need for a false bottom plate. Its unique dual-header underdrain design encased within a sloping concrete subfill, makes it possible to remove spent carbon easily, in slurry form, without the need to enter the contactor. Roberts’ stainless steel Microwedge Strainers installed on the underdrain laterals ensure efficient and uniform collection and distribution of both service and backwash flows.