I'm not an any way saying that air pumps and diffusers don't have their place and aren't better in certain applications. That being said, where do you get these numbers? The manufacturer or independent study? You are also comparing apples and oranges. As all variables on both sides are not included within the same application. I'm not trying to be argumentative for just the sake of argument. I'm just looking at it in a very strict scientific way. If there are independent studies to compare total water movement in a closed, controlled environment between the two, I would love to see it. I have an open mind and I couldn't care less which is "better" I just don't take someones word for it when numbers are being thrown around. Like you said, please don't take offense, only a conversation.