If you are working with the low DO brewing, I'm out. Short of plumbing a corny keg between the fermentation vessel and one of these catchers, you won't be happy. This was designed to make my life easier not to conform to a pdf's low do standard. While I understand why it's something that people want to persue, in all the discussions I have seen on the topic, there is a lot of losing the forest through the trees. Or however the saying goes.