Pool closed due to poop - question

During the first 50 of warm-up I spotted poop this morning. I confirmed it on the 2nd 50 and got out to tell the coach. Eventually they closed the pool, cleaned it out and threw in some chlorine directly in to the pool. But then they reopened about 30 min later. I was a bit shocked that they opened it so soon. The pool is a 50 meter x 25 yard pool so pretty big and they only threw in one 5 gal bucket of chlorine before letting us all back in. Does that sound right? If I remember my life guarding days right, poop means several hours of shutting down. I was disappointed to have the workout suspended but I certainly didn't want to risk us getting sick, either.