If it smells bad, then maybe some microbes got in which isn’t a great sign. However, just note that’s sprinkler system isn’t designed to “be nice”, it’s designed to save lives. Clear water or nice smelling water is the least of their concerns.

It was a ground up new building right? They definitely wouldn’t save materials from an older building. That’s asking for a world of pain and liabilities, plus it would just be burning money on labor costs to remove and save the piping rather than just a pure demo scope.

People often assume that renovations and reusing old materials means lower costs, but that’s often not the case. Older buildings means inheriting the wear and tear of decades of usage. Sure buying an older used car can save you some money, but if all the parts are nearing the end of their lifespan, you’re going to be shelling out insane amounts of cash just replacing parts as they fail one by one.