How to increase 1 x 10^9 to 1 x 10 ^11 cfu/ml Bacillus subtlis in solid or liquid fermentation?

Some companies claims they have bacterial concentration to the tune of 1 x 10^11. But in our culture technique we could maximum culture 1 x 10^9 which is (1 billion cfu/ml)

12 December 2018 6,343 10 View