Aquarium Currents - Our Product is the Sea Swirl. We have been manufacturing our product since 1998. The Sea Swirl is available in 1/2'', 3/4'' 1'' and 1.5'' models. It is an external device that connects to your existing pump return from your sump. It Produces oscillating current. It rotates 90 degrees every 30 seconds. It is MAINTENANCE FREE and is very energy efficient by using only 4 watts of power to operate. We are currently introducing a product that will oscillate Tunze Controllable and Non-Controllable and Korallia Power heads along with a new smaller Design like our 1.5'' model that is ''One Size Fits All'' model. 1/2'', 3/4'' and 1'' will be in a single product box.