dracor, I think the ecoplus is lying about the CFM ratings...I just can't see an air pump producing the volume claimed at such low energy usage and with such a small outlet on the pump. It is a diaphragm pump, and will have a LARGE air flow volume drop at 4.5psi of pressure (a 9 foot depth)...I could not find any flow specs from the manufacturer, only specs for the pump weight and shipping volume. Adding much tubing length in the 3/8" pump outlet diameter will rapidly increase back pressure and further reduce the CFM capacity