[logicallee]

Edit: I got downvoted. Is a powered vacuum pump not possible in this application? (Like putting a vacuum cleaner nozzle against the wall, possibly using a more powerful motor than usual, for more suction.) I think it's a fair question but maybe I'm way off base here.

[marcusjt]

Presumably you were downvoted because your question suggests that you haven't actually read the article, which does mention how it compares to other powered suction (i.e. "vacuum pump") devices.