Planted Tank Guru
Join Date: Nov 2009
Location: Missouri united states
Would work better in reverse flow with external filter to clean the water that is being pushed up through the gravel.
Video I watched only showed substrate area around drain from tank possibly being cleaned as water passes over it and out the drain.
What about a large long tank/ ?What would clean the substrate for you on the other end?
Is why the above pictured design with slit's in grid work, or perforated holes ,would work well at preventing the need for vaccuming in reverse flow operation.
Would not work with soil's and sand's and not sure of the harm/benefit in tank planted with stem plant's or carpet plant's.
Reverse flow would need external filter in my opinion to further grab particulates that are being suspended in water column as opposed to being drawn down into the substrate.
Mostly a benefit combined with water changes to keep cleaner water/substrate for fishes.
Configured as it is in photo above ,the system would eventually result in the slit's(If that's what they are) allowing very fine material to be also drawn into the tubing and bacterial biofilm build up just like filter hoses,intake tubes so rather thanoperation as pictured,I would want reverse flow operation.
It does work well but as you mention,it takes powerful powerhead (s)
When I used the reverse flow undergravel filtration, I employed two Aquaclear 70 Powerhead's (old 802's) that are capable of reverse flow but lose some gph in reverse flow compared to 400 gph in circulation mode.
Last edited by roadmaster; 01-19-2017 at 08:01 AM.