Using this air pump to feed two air stones in a 100 gallon tank. Air output is great and the pump runs virtually silent. There is no air flow control on the pump itself but a couple of flow valves are included to use inline. I use a couple of check valves (not included) to protect pump in the event of water back flow due to a power outage or something in addition to the two flow valves. Simple operation and hopefully the pump will last a while.