Super Quiet ; Energy Efficient Via-Aqua 1800 Pump,The Via Aqua 1800 pump in the economy series is fully submersible, features whisper quiet operation, energy efficiency, and an oil-less water pump.The Via Aqua 1800 pumps compact design makes it a perfect pump for Fresh & Marine water.The Via Aqua 1800 submersible pump is designed with a built in flow control adjustment.