cold brew does extract differently. but yes, it's also generally old even when fresh. the stronger i brew it the less stale it tastes to me, so I wind up with a very high brewing ratio of something like 6:1 or less. and i like to drink it neat :-)
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- 2 yr. ago
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- 2 yr. ago

oh neat invention. maybe it just has some one-way valve(s) to keep the steam pressure in that get overcome by the air pressure from the pump.
https://en.m.wikipedia.org/wiki/Check_valve