I just recently bought an Eco 7 and after a couple of days I must say I am with Bill on this one. It certainly is pumping nothing like RC51's video.
I have it attached to two 9" diffusers which at first were placed so that one was at about 4 feet and the other at 6. I would estimate that 90% of the bubbles were coming from the shallower one. I'm going to do a little more experimenting but at this point kind of disappointed in the Eco7.
