Aquarium Internal Filter 3-in-1 Multi-Function Pump 20 Gallon Water Pump (80 GPH) Max Flow Rate: 80 GPH (300 L/H), Fits tank size up to 20 gallon Adjustable flow rate, compact and versatile unites are ready to use (no additional tubing or circulation pump required) Install in vertical or horizontal position right in your aquarium or sump Perform three functions at the same time: water filtration, water circulation and aeration Recommended tank size for water circulation and aeration: up to 20 gallon; recommended tank size for filtration:up to 15 gallon