In this video I explain how a bubbler is built and what it is used for. Also explained are a couple other bubbler lid configurations that others have done.
This was my 2.5 hp Water Pump that I retrofitted to be a demo unit. Notice the bubbler to the right.
Here is the basic setup of a horizontal reactor with the bubbler. With this picture I was able to build a GEET unit in a couple hours with minimal tools and parts.
Training Video:
