Tanks of syrup

Most people enjoy a nice cool Slurpee every now and again. Even though I live in the Slurpee capitol of the world I had no idea how the machines worked. The video above makes it sound like the process is a bit more complicated than it is. I was thinking there would have been a bit more going on under the hood. I had envisioned some type of automation that determines the level of slush left and triggers some type of refill process from a bunch of different tanks of syrup, water and liquid sugar. I guess there might be some machines that are more complicated but overall there isn’t much going on. But that being said the resulting slush is so refreshing on a hot day!