I have watched videos in this " reverse flow under gravel filtration" and its all about pumping water down the tubes and having it come up from under the gravel.
I'm talking about water changing device that will suck all the waste from the gravel, perhaps the opposite of what this is doing.
Unless you are suggesting I can use this but reverse to do water changes with a more powerful pump? Is that what you mean?
In reverse flow filtration there really isn't any waste on /in the substrate to clean/vaccum,(get's pushed up into water column for external filter to grab) which is what I thought you were aiming at (my bad).
Water changing device I use is 50 feet of Python hose with mag pump attached and pre filter over the pump intake to prevent shrimp's/fishes from being sucked up.
With sand substrate's, the waste stay's on top of the sand, and just need to hover over the surface close enough to suck up the debri but not close enough to suck up sand/plant's.
I would take pump off the hose and just use hose to suck up around the plant's .
Put the pump back on the hose for water changes.(works for me).
Automated drain and fill system's for aquarium's are plentiful but for cleaning substrate/trimming plant's,,,you bout gotta get wet IMHO.
I just plant as much as will fit in the tank, and then can say I couldn't vaccum if I wanted to.
Good water movement,clean filter material regularly,regular water changes,netting out loose plant matter /leaves when I see them is my method.
Was always inpressed by the large fluidized sand filtration plant at largest aquarium in U.S. at Atlanta Ga.