Co2 out of a 4L Milk jug

Okay, I do realise that there are about a dozen or so threads based upon this very subject. In an earlier post I had made....(I believe) the dimensions of the shed (grow area) are as follows 5.8ft (L)x 5.8ft (W)x 7.2ft (H).....now this is where I get stumped, I realise the boards are pretty much split on wether or not the Homemade Co2 setup actually work.....reading through other forums, they too are split wether or not it works....some have sworn by it, others are skeptical, like myself....

If the Mods don't mind, I am going to bounce off the idea I had in mind.

With the grow area being relatively small (once the area has been divided), I was thinkin of using 2 4L Co2 jugs in the flower chamber, and one jug in the veg room....

Now I too thought of having the Co2 jug higher than the plants, then it occoured to me that there are 4 tomato stakes laying around from an earlier garden, with that I could run the tubing around each circle....or I could have the lines directly down the sides of the stakes....I could then run the end of the Co2 line(s) back into the reservoir...(after approx. 2 wks) I could then have the air pump bubble up the oxygen mixture to the roots....utilizing any remaining gas (if any), then cleaning out the res after everything is done...

I thought maybe with those 4L jugs.....I could produce nearly (estimate, mind you) about 2L of Co2 per jug every two weeks or so (that's why I said estimate...lol...I have no clue)......I figured if I filled the jug 3/4th of the way, I could theoretically have more than enough for an 3 mth. flowering period.....

Any thoughts/suggestions or ideas guys/gals??

Thanks all,

Buddy