Propeller Nozzle Technology
① Dead spots with relatively poor water movement.
② Very strong flow in the center,making coral placement very difficult.
③ Very weak flow near the other end of the aquarium.
Cross Flow Technology
① Virtually no dead spots.
② Evenly distributed flow rate throughout the entire aquarium.
③ Water bounces back from the other side to create a full circulation.ie.generating "gyre flows".