I'm confused about the term "inventory". I assume this refers to...

I'm confused about the term "inventory". I assume this refers to brine in ponds. (Please correct me if I am wrong here. I'm assuming the brine cannot be stored anywhere else.) But can it really be referred to as inventory when (I assume) it is partially concentrated so it can't be used in processing, so in reality it is only partial inventory. What I'm saying is, it's not like an inventory of stock like widgets that are fully formed and can be sold at any time. Or am I being overly pedantic?