Microbacter can be kept on a shelf. Other options such as FritzZyme needs to be refrigerated and may last for like only three months, so could be something as simple as making it easier to just stock the shelves and have the products be there for a while.Thanks for the prompt reply. I'm not necessarily in a rush, but wondering why my LFS would recommend Microbacter vs the other options? Any idea as to why that may be?