I know that this is really popular in the discus and koi hobby. Most people make small air driven pop bottle filters in there discus tanks or put large amounts in sumps with a ton of air to keep it churning and because its so effective it can bring o2 levels lower so alot of air from an airstone is key with large amounts. Once again this is all from the freshwater hobby. This is the first i have heard of it being used in the saltwater hobby but it very well could be used by lots of reefers. I believe it comes in a couple different sizes and was originally developed in germany (i think?) For large scale water treatment plants. If you do a quick google or youtube search you can see tons of the air driven pop bottle filters or sumps.
I am by no means an expert so id do your own research before taking my word as gospel.
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