The title of the product often describes the size of the batch and there are 2 ways that this is displayed. 1. Directly (in litres). Eg) Bulk Set Y 621 LYO 500 l = up to 500 litres 2. DCU (Direct Set Unit). 1 DCU = 10 litres. Eg) Choozit Alp LYO 100 DCU = up to 1000 litres Our starter cultures can make batches ranging in size from 1 litre up to 5000 litres.