Ideal Caris Internal Submersible Pump High lift and heavy traffic Quiet design Durable and well-insulated Filtration is the heart of the aquarium, as fish need completely clear water to stay healthy in the tank. Filtration can be biological, mechanical, or chemical. The product features a filter sponge that absorbs dirt and purifies the water. Suitable for both freshwater and saltwater. Fully submersible and ideal for filtering any aquarium. Extremely quiet, energy-efficient, and easy to clean. *Model: QL-850F Power: 4 watts Flow: 400 liters/hour Voltage: 220-240 volts 50-60 Hz *Model: QL-950F Power: 6 watts Flow: 600 liters/hour Voltage: 220-240 volts 50-60 Hz