09-15-2009, 08:51 PM
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Originally Posted by nomel
Byron, it's called a reverse under gravel filter...and they're generally more efficient and less hassle since they don't clog (flow upwards rather than down into the rock). The intake would be somewhere in the tank, the outlet would go down a under the substrate...something like attaching the outlet to the bubble tower on a regular under gravel. And, that's one of the points of a reverse undergravel...the particulate matter is kept out of the rocks, into the water column, into the intake of the filter where it gets trapped by the filter material...clean water comes out under the rocks and up through the substrate...do this over and over until you have a clean water column...like any other filter...
In a planted aquarium this does not sound very sensible. We want the detrius to settle into the substrate where it can (once broken down by the aerobic and anaerobic bacteria) feed the plant roots. There are those who advocate gravel substrates being no good for plants solely because they are too "clean" and contain no nutrients. While I do not hold that view, it seems this reverse UG filter is even worse.