I am not sure if it goes all the way up or not but if they are testing the pumps than they wouldn't need to fill it all the way. Plus you can see the differences between the pools and how the one on the right has rain water.
That happens to be right where the trims are. Maybe they are adding magnetic brakes, which would be awesome (That's probably not the case, but I can hope). Or maybe Magnum will become the tallest and fastest wild mouse