This is a take on the old way of making compost tea (including manures) in old Hogs Head barrels, to that was added lime ( could use wood ash) to neutralize odors. Read the book Ten Acres Enough and you learn of how it’s judicious use made a six acre homestead produce far more than much larger homesteads. He became the talk of the town and was settled on not taking on more land because his produced so effectively.