Quote:
Originally posted by Graystar
However, I may be misunderstanding again. Are you suggesting that the water be pumped through the holes in the middle layer? I ask because I was thinking that the top and bottom layers would be fed in the same way that it works now. If you're thinking of pumping the water through the holes, then, I don't like the idea, mostly because you've now created a place to trap air (the original design was also meant to pump air through as well.) Also, in that configuration there doesn't appear to be any real "route" for the water. I mean...yes, the water will go in and come out, but you don't get a sense that every water molecule is on a definite track getting in and out. You might have some hot spots.
Of course, trying it is the only real way to tell. Go for it! 
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You are not misunderstanding again. That is what I was asking if was good idea or not. And with your explination it looks like it would be a very bad idea. But I may just have to try it to see how bad is bad.
Appreciate the feed back.
MD