04-14-2011, 12:02 PM
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Originally Posted by 1077
Don't know why you would not favor
(Challenge) powerhead's with reverse flow capabilities(Have you tried it?) In undergravel filtration,
with traditional UG filter,dirt and debrii is pulled down into and under the plate which requires the reg maint you speak of to remove the crud( Anaerobic condition's)) that finds it's way under the plate.
With powerheads capable of reverse flow,, the water is pulled from the aquarium from atop the lift tubes via the powerheads in reverse flow, and water is pushed down and up under and through the plate, and no crud can collect there depending on the GPH rating of powerhead's used.
Does require pre-filter over the intake /output of powerheads assuming you wish for the inner workings of powerhead's to stay cleaner,longer.
Also need canister or HOB filter to clean the water that is being pushed back up through the substrate and once again pushed back down and under the plate. This is /should be,oxygen rich water.
Is very effective filtration for large fishes that produce a lot of waste both while eating,,and excretement. This waste is prevented from gathering on the substrate, down in substrate,/under filter plate, and water turnover is usually sufficient to keep particulates in the water coulmn for afore mentioned canister or HOB filter to clean.Just need to keep mechanical material in filter clean but otherwise,,no more difficult than other filter maint which should be cleaned regularly.
Just realized I never responded. The reverse flow concept isn't bad, but unless throttled way back, I think power heads, moving water in either direction is bad. The UGF works best when highly oxygenated water is moved slowly through the bed. Bubble up UGF's with relatively clean gravel always worked well for me, and if it ain't broke don't add power heads and/or change direction.
BUT there is a real problem with UGF's the way I think many people use them. If the gravel is not cleaned with a gravel siphon or other method, they are a ticking time bomb of a decaying mess that will eventually plug and turn out badly.