ADA Aquarium Air Pump 3.5W 3.0L/Min Ultra Silent High Energy Efficient Fish Tank Oxygen Air Pump

This pump is pretty quiet. The only real sound is from the small vibration where you sit the pump. This could likely be remedied by a small piece of rubber between it and the hard surface it sits on if you wanted. Though unless you are really hearing sensitive I don't see this being a real problem.👍

Plenty of bubbles! Could be a lot quieter. Air flow is not adjustable.

Does it's job

We bought this for the fountain outside in the turtle habitat. It keeps the water flowing without getting it clogged up. So the birds and turtles have moving water and no pesky pets.

Not what you would expect air flow wise for a double outlet.

This pump is not adjustable for airflow output as advertised. I even took apart the unit to see if the internal mechanism was broken and I could manually adjust the airflow. Turns out it is just a ring of plastic that spins around a fixed pipe. There is nothing that the adjuster ring is attached to that would make it adjust anything. Adjustable, my rear. That being said, if you need an air pump that just blows bubbles for an air stone then it'll work fine. If you have it attached to a bubbler that you need low output to operate the device, then this isn't for you.

Great value does the job use it for hydroponic tank

Works fine. Very loud