I've got this idea...

[Jim Nilsen]

Anyone have any ideas on how perferated stainless would perform, rather than solid plate? By the numbers, there is less surface area, but I think the holes would aid in bubble production.

There is a Youtube from a guy who used 2 tea strainers that were just wire tied together and the thing just turned into a cloud of gas. With the wire mesh it really had some surface area and less displacement.