The Berlin Turbo utilizes a new 12 blade TurboJet Impeller that actually creates a significant positive pressure enabling the skimmer to operate the triple pass and do it without an additional pump!  The Berlin Turbo comes with the pump (fitted with TurboJet Impeller).  The Berlin Turbo is up to 70% more efficient than other skimmers its size and can run up to 500 gallons (depending on model)