First 12 HL Cavitation brewing system Posted on April 13, 2018 by Mark Flynn Trial system: first 12 HL system of its kind. This system was used for testing purposes. Sadly, after production difficulties, it looks like we will not be able to obtain this system. Its promises, including all beers being gluten-free, still entice us, but the manufacturer still seems to be in product testing mode, even though our order was placed well over a year ago. It looks like we may now be forced to go with a conventional 10 to 15 bbl system.