Depends how you build it. Like I said, why don't you build a bubble remover. If you want quiet, use thicker walls.what about the bubbles and the sound it makes all the time
Most UAS scrubbers (almost all) you have seen so far have just been 1-sided, and you are comparing them to 2-sided waterfalls. Can't do that. You need to compare 1-sided to 1-sided, or 2-sided to 2-sided.
You may not know it, but it took 2 to 3 years to figure out how to get waterfall scrubber to "grow green".