2.7 Reverse Flow UGFs
Description
This article is from the ReefKeepers FAQ, by several authors (see the Credits section).
2.7 Reverse Flow UGFs
An attempt to solve the detritus buildup problem associated with
normal flow UGFs. It's a good idea that doesn't work well in
practice. This system has problems with uneven water flow due to
channeling within the bottom gravel.
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