How do you reduce oxygen in the cold-side of your brewing system?

I enjoy a well made NEIPA, though I’m not in it for the haze, the lactose, or the milkshake. But Trillium or Other Half are very well made beers. Previously I was dry hopping during active fermentation, but I miss some of the edge you get from dry hopping after hitting terminal gravity. But, the benefit is reduced oxygen exposure.

So, what about a magnetic release hop chamber? It could be added under the lid, during fermentation after the risk of blowoff but while it’s still bubbling. I have a SS brewbucket with a flat lid. I think I could easily rig something up with a nylon mesh and some rare earth magnets.

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