OG-wan Kenobi
Arcane Artisanal Ales
For me pure O2 was a big upgrade I have very good water quality and my basement temperature is very stable within 2 degrees 68-70 so maybe I had a different situation than others a stir plate was also a nice add on both were cheap my next upgrade will be stainless fermenters I can tell you the worst upgrade I made was the stainless brew siphon big money no reward