Lylo - You might consider adding some sugar to boost gravity. Mashing 13 lbs in the 20l to yield 5 gals should get you around 1.060 OG. two lbs sugar should boost OG to Around 1.080. Boiling for about 1hr 20 min should get you down to 4 gals with OG around 1.100 which is at the high end of...
