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New Counter-current Swimming Equipment. The innovative design and concept supplied as a kit ( featuring dial, housing, control box and jet floor pump ) make it a element which will add significant value to your pool. A highly competitive product thanks to its top of the range hydraulic features, the Marlin Counter-current System is available in 3 models, the Marlin II, the Marlin 30 III and the Marlin 45 III. Possibility of attaching grab rails to hydro-massage hose (optional).