Due to its flat shape, the culture column is stored lying down after Kolle and thus permits a relatively large growth surface. A retaining bar in the oval neck prevents the liquid culture medium from leaking out.– A retaining bar in the oval neck prevents the Liquid culture medium from leaking out – Due to the flat, large floor surface, the layer cover of microorganisms can grow evenly high – The large liquid surface ensures better aeration and thus faster growth of the microorganisms – – Due to its flat shape, the culture column is stored lying down after Kolle and thus permits a relatively large growth surface. A retaining bar in the oval neck prevents the liquid culture medium from leaking out.– A retaining bar in the oval neck prevents the Liquid culture medium from leaking out – Due to the flat, large floor surface, the layer cover of microorganisms can grow evenly high – The large liquid surface ensures better aeration and thus faster growth of the microorganisms – –