Jen got some walmart orange juice, and since I'm kinda on an anti-walmart kick right now let me explain to you just what my first impression was of this 'juice'.
I'm not sure what you think of when you think of orange juice refinement, but I think it goes something like they pick the oranges, put them in a juicer, juice em to death and then bottle the juice or freeze the concentrate. they then discard the pulp i'm sure. well if walmart juice were in this block diagram I would say that they don't throw away the pulp, instead they put it back through the juicer for 'round 2' and that is where walmart juice comes from... bitter, barely orange remnant that is technically juice, but tastes nothing like it. because that was too hard to draw a picture of I have drawn another to relay my sentiment.