He's mentioned before that it is super quiet. Something that hasn't been mentioned before in this thread is that Basso's design only does around 1-1.5X water volume turnover per hour. That's ~57 gph in Manochio's case. So the 3 returns are quiet.
Something else about Basso's design is that he only uses a horizontal ATS and a protein skimmer for filtration. And just for clarification, the 2 pumps are just to keep the water moving.
I'm trying to figure out how to recreate that unique plumbing loop for the pumps with US fittings.