I have serviced commercial pools since I was young. Boy is that a long time...
Getting back to the subject at hand....
I would get calls now and then about this happening, or a little tyke leaving a brown trail from a dirty diaper, or somebody having a bit too much to drink and taking a dump in the deep end for a 'laugh.'
I would have to pretty much drop whatever I was doing, or send somebody, and we would have to clear the pool area and lock the gates.
We had to remove the material if there was any. Shock the pool or spa to around 10 ppm and hold it there overnight or as close to 24 hours as we could.
Backwash the filter once, run it overnight and then tear down and hose out the filter.
Then we could reopen the pool or spa.
In most instances, if there were lots of witnesses, we would be asked by the owners/managers to drain and refill. If it was a spa, we did it anyway so we wouldn't open it back up with the chlorine level way too high. But the fact is: we still had to sanitize the pool the same way if we drained it or not. Removing the water from a big pool takes time, and the 'stuff' can be breeding in the little bit of water which is always left behind, and in the plumbing.
Plus, it makes it to the filter before I even show up and scoot people out of the area, so draining a pool for this is just to make the people who use it feel better.
One final point - if a person is healthy and 'stuff' comes out, there is no real hazard, providing there is chlorine in the water. I don't recommend you try it just for fun. But, if the person has some sort of flu or other internal problem - as the girl in the spa video appears to have had, that can be communicated. But it is rare that it
would be communicated, as it pretty much has to be
ingested.
OK - you may now go puke.
BTW - this is one of the reasons I had so much trouble keeping pool cleaners on the payroll when we did mostly commercial pools. You never know what kind of crazy thing was going to happen to make your job just that much more fun.
