Here is my newly built AACT brewer.
My old set-up was an X shaped PVC diffuser in a 5 gallon bucket. I imagined there were some 'dead zones' along the bottom of the bucket where the bottom met the side. My redesign is based on intelligent theory, instead of any actual microscope analysis.
Someone once dropped the idea of cone bottom tanks being used as a way to nearly eliminate dead zones. I experienced a little problem last summer with my vegetable/flower gardens and foliar spraying with my AACT. I think I introduced a little bit of 'nasties', particular to my tomatoes, peonies, peppers, and squash. I think most of that had to do with poor quality compost. But it still got the idea of cone bottoms churning in my mind again.
My 5 gallon vessel is QUALITY
built! Heavy, thick plastic. The lid is vented. My gallon marks aren't painted bold/black though, no biggie. Here's a stock photo.
Here are some pics of my new set-up. I built a little table out of some scrap 2x4's and plywood.
I might need a little teflon tape to completely seal the threads on the bushing. These were loosely hand tightened and were dripping ever so slightly during my 'test run'.
Here is looking down inside the vessel. The angle of the side slope to the flat bottom is fairly open, to help eliminate dead zones. The air outlet is a 3/4" straight-pipe opening. No water backs into the air tube. I have been trying to think of a way to put a diffuser on here, but don't really even know if I need one.
Here is a pic of the bubbling test water in action. I am using a 70L/minute commercial air pump. I'm actually hoping there's not too much agitation, but I've heard thats nearly impossible. This is definitely Actively Aerated! The way it is setup now produces a nice column of air that really cycles the liquid. This really gets the water churning, breaks the water's surface tension, and produces a lot of movement of the suspended particles. I don't use a tea bag.
Any thoughts from 'the pros' or anybody else would be welcomed!