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Sea-swirl rotating return devices provide desirable, chaotic movement of water by rotating a return nozzle through 90 degrees every minute. This helps eliminate dead spots and keeps sessile invertebrates (particularly SPS species), in good condition. Currently, ReefOnline offer the ½" model, rated at 550gph (2081 lph).

Note: Sea-swirl devices do not generate flow themselves - they simply oscillate the return from the system pump or an auxiliary pump.