BD supplies greater than 400 different Difco and BBL brand media formulations in dehydrated form for the convenience of the laboratorian and bioprocessing specialist. Certain formulations are designated by a "II" in the medium name; these formulations are improved to provide more consistent, superior test results than earlier versions. The individual ingredients and the final dehydrated product are carefully quality-controlled to assure consistent, high quality performance and obviate the need for media to be prepared in the laboratory from raw materials. Dehydrated culture media may be offered as 100 g and 500 g bottles, 2 kg, 5 lb, 25 lb and 10 kg containers.