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Hydor - Bioflo Aerobic Wheel Medium Water deflecting aerobic filter pump. Rotating filter system, ideal for removing ammonia, nitrites and surface deposits from aquarium water. Moves aquarium water, increasing oxygenation and surface gas exchange, preventing the formation of white line effects. Creates a beneficial wave effect which moves plants and invertebrates. Small- Suitable for aquariums with capacity from 90 liters, Medium- Suitable for aquariums with capacity from 150 liters, Large- Suitable for aquariums with capacity from 250 liters.