Built a vortex brewer for my compost tea for $45 even in parts from Home Depot (excluding air pump):
5 gallon water jug with NO handle (a handle will make it worthless, $10 if you can't find one for free - I could not).
3x 1.5" schedule 40 PVC T connectors.
2x 90° schedule 40 PVC elbows.
2x 45° schedule 40 PVC elbows
10ft 1.5" schedule 40 PVC.
1.5-2" rubber adaptor with clamps.
10" circular irrigation valve cover (The base, you could build a base, but this is PERFECT, and only $10 - the lid makes a good lid for the bottom of the jug as well. They had them in black and tan, the tan one did not fit immediately and would have required modification.).
I only used about 6ft of PVC, but they only had 1.5" schedule 40 in 10ft sections - $5, no big deal.
Anyway, cut out the button of the jug as pictured (used my BHO torch to heat a knife, shit's tough), and then locate where the seams cross on the sides of the bottom, use them as centers to make sure the holes you drill for return are even (used a hole saw). Then take the rubber adaptor, fit the 2" side to the mouth of the jug. Cut a short piece of PVC and put it into the side of one of the T connections, then put the exposed PVC into the 1.5" end of the rubber adaptor - there should be NO space between the T and adaptor.
Next, run the pipe out to the sides - the valve box has two holes in the side already which are perfect. Add the 90° elbows, pipe up to the next two T connections. Add a bit of PVC on top to keep things from splashing, and a couple very short pieces to the side, which run back into the jug as return lines. I cut off half of one connection on both 45° elbows in order to keep them closer to the walls of the jug - stick 'em on, about 30° down worked best for me.
I am having the tea spin counter-clockwise as I am in the Northern hemisphere to take advantage of the Coriolis effect (direction water spins going down a drain). This is pretty much pointless, I could have easily gone the other way, observed directional draining is nearly always caused by movement/design/etc... but I am using a pump which should be too small (definitely not).
I am using the General Hydroponics Dual Diaphragm pump, two valves closed, and two running down each upright to a small air stone. Most designs suggest 100 l/min and use FOUR uprights (involves custom making a splitter from the mouth of the jug, but four connections allows it to stand on it's own), however the valve cover/box/thing works PERFECTLY, and I was uneasy about making my own connector, as things need to be much more exact in order to prevent that custom connector from bearing the weight. I chose this pump, despite costing the same as more powerful commercial pumps, because it is more silent than an Active Aqua dual outlet pump, and noise is a concern. This pump only delivers 24 l/min, but the vortex extends all the way down to the mouth of the bottle from the bottom, so it's doing it's thang.
The only issue I ran into was sealing the return lines to the jug, and no, they don't make grommets that big (or I couldn't find them, at four stores), so I used some 1" grommets and cut them, and they cover all the the bottom and sides... the top will never be in peril of leaking, so perfect! I skipped aquarium sealant because I wanted everything to come apart if/when I wanted - everything is press fit, no sealants, no leaks...
I decided not to use a bag for the Earth Compound, I'll just filter it when I need it, and put the dregs back into the jug, topping off and adding more food, keep it perpetual...
Sorry this isn't more detailed and has only two pictures, whenever I log into RIU I get pissed off that the majority of this cycle is missing - from now on, copies of every post are going into Evernote.
PS. The picture from the side is before it was finished, the uprights were 1cm too long, jigsaw battery died, too tired to finish, blah... irrelevant.
EDIT: I know, Bud Light, but this Platinum shit is legit. 6% (most light beer is pretty much literally watered down, fewer calories, but less alcohol as well... so it's a wash as you end up drinking more) and only $7 a lunch box, and while it doesn't taste amazing like Young's Double Chocolate Stout (what the fuck you know about delicious?), there is nothing bad about the flavor. And seriously, blue glass bottles? Pimpin'.
Interestingly, Guinness has fewer calories than Bud Light! If you care (I don't), it's not about light vs dark, etc, etc... Don't be a stupid college girl (not sexist, just true), know your shit.
EDIT2: Make the T section coming out of the mouth, and the T sections used for return lines after cutting up the jug, but before anything else; it will make measuring much easier. Always err on the side of too long, because you can always recut it shorter, you can't cut things longer... but the four extra feet will give you a net.