I wish they were available too. Other than the eco wheel, I could not find any units to buy anywhere, much less something about the size of a book.
I'm going to start working on a spraybar (maybe "water outlet" is a better term).
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Inventor of the easy-to-DIY upflow scrubber, and also the waterfall scrubber that everyone loves to build:
http://www.reefcentral.com/forums/showthread.php?t=1424843
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