What volume measurement markings are visible in the Conical Fermenter? The measurements are in both Litres and US Gallons 15 L up to 25 L 4 US Gal up to 7 US Gal Related articles What is the maximum boil volume on the G30? What is the height from the bottom ferrule of the Conical Fermenter to the floor? How does heating work in the Conical Fermenter? How long can I leave my beer in the fermenter after the SG reading is stable? Video - Quick Overview of the GF30 Features