I read all the time that you should use a secondary glass carboy, but not sure why it has to be glass. If it's OK to leave the wort in the primary for 2 weeks and then rack to a bottling bucket, why could you not leave the wort in the primary for a week and rack to a secondary plastic bucket for a week or 10 days? Why does it have to be to a glass carboy? I have read that a plastic water cooler jug won't work either because it might somehow allow oxygen in through the plastic (not sure how that's possible). I understand the water cooler jug might be a little hard to clean. So why couldn't I use another bucket and then fit the lid with the bubbler on it as the secondary?