Hi thank you for your comment, freezdried food is frozen, with all of the water content being evaporated at the same time so the h20 never 2'd. It's hard for me to explain in this one comment. I mainly use / Used mine to preserve foods for the next 20 years. I'll link photos, it's about the size of a small fridge. Commercial grade, Yes. Expensive? Not if you put it to work and have it pay for itself.