I've stored UCSB water for months in dark gray containers with no isues. I think they do a good job at filtering the water. There is a big difference in their raw water holding tank and their filtered water holding tank. The raw one is full of all kinds of stuff growing while the filtered one is clean.
Since they us ethe water in their research labs, I don't think there is much left in the water.
Justin, did you get teh water from the "reef" building? Or from the old building where it used to be available to the public? Is the water available 24/7 down there?