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UAS air flow vs. Water Flow
From reading the results of UAS tests here and comparing them to the waterfall scrubbers it appears that there may be some kind of correlation to the amount of water flow through and over the scrubber and the amount of Nitrate and Phosphate usage by the algae.
Just running bubbles up a scrubber by itself doesn't seem to work as well as water flow????
A smaller tank with a HOG .5 may get enough water flow caused by bubbles, but a larger one may not using the surface area calculations and air flow rules that SM has posted.
Just relying on the air to push the water past the screen as well as the bubbles may not be quite enough.
Obviously you can have quite a bit of water flow if the area is constricted enough - holes at the bottom, going out the top. After all this is the concept that powers undergravel filters and also with air stone driven skimmers.
Would a venturi pumping water into a constricted area - with an air hose attached - going up past and through a screen -and out the top similar to a skimmer work better for larger tanks?