In a pinch for air I bought an EcoPlus 7 air pump.
I like this new EcoAir pump.
EcoPlus Commercial Air 7 - 200 Watts - outputs 200 liters/minute @ 5.1 PSI - It will pump as deep as 141” 1/2" ID TUBING
EcoPlus Commercial Air 5 - 80 Watts - outputs 80 liters/minute @ 4.2 PSI - It will pump as deep as 116”
EcoPlus Commercial Air 3 - 35 Watts - outputs 65 liters/minute @ 3.9 PSI - It will pump as deep as 107”
These run much cooler and slightly less noisy, but I've been on the hunt for a good deal on a Regenerative Blower and today won an e-Bay bid for an Ametek Rotron EG DR083. This is an ultra quiet 18.4 cubic feet per minute air blower. That's equal to 521.03 liters per minute! It should draw about 100 Watts, but it will push air nearly 24 " deep.
The Hydrofarm ActiveAqua pushed 70 lpm at zero inches. This regenerative blower will deliver 70 lpm 20" deep!
My thinking on this is that I may be able to pump water while aerating. Looks like I'll be getting back into air lifts.
The main reason I wanted this pump is dependability. A piston pump seems to me like a self destructive device by it's very nature, and besides that they are loud and annoying.
This short video contains good information about air pumps, blowers, and distribution systems