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This AquaTech Power Filter 10-20 provides filtration in three stages, which will keep your fish healthy and water clean. AquaTech Aquarium Filter Cartridges There are four sizes of Aqua-Tech filters: 5-15, 10-20, 20-40, and 30-60. The model titles reflect the number of gallons the filter is designed to maintain. 10-20 sistemas de filtración de agua Descargar manual en PDF. También por: 20-40, 30-60. Power Filter. Verify Your Model. Model. 20-40.