Neither product needs to be refrigerated because neither has any living organisms in them, unlike a quality product like DT’s. Kent is a great marketing firm but a terrible manufacturer, I would not put any of their products into my tank.
DT's is a live Marie Phytoplankton product. It comes in different sizes I use the 30 ounce one and needs to be refrigerated.. When buying it look at the expiration date too, it has a shelf life like milk, but longer several months.......... Warren