I played club water polo when I was college. We would have tournaments at neighboring universities and we once visited a pool that was apparently sanitized with

I played club water polo when I was college. We would have tournaments at neighboring universities and we once visited a pool that was apparently sanitized with bromine instead of chlorine (The bromine pools had a much saltier taste). We were warming up for a game and someone noticed that peeing in the pool actually turned the water green, and we all started doing it. The lifeguard saw us all huddled by the edge and asked us to stop.