Originally Posted by TychoBrahe
I beleive the only beer that Allagash does not filter is their White. I don't believe you have their Brett in those dregs
Edit: let me clarify. They filter out the brett and repitch a clean yeast for bottle refermentation. This was explained by Rob Tod on "The Session" a few years back
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I've listened to the interview several times and I don't think that's the case. IIRC, he said that at the time they only used one sacc strain and one brett strain at the brewery. Filtration or centrifugation isn't capable of entirely removing any yeast, which is why some breweries choose to flash pasteurize their products, although Allagash does not. They do use a bottling yeast, so if OP grows up the dregs, they will not contain just the brett strain.