I did such a thing in K-ville Tx my sophmore year of H.S. in 1991.. Dad had an old sea locker from VF-84 full of all sorts of goodies...(including flares and sea dye) in the garage...of course I had to pop the lock. I tossed it in my buddy's smallish, kidney shaped pool. He was hosting a huge party because his folks were out of town. The long and the short of it.....initially, the pool turned this crazy, neon, chartreuse color under the lights....it was a big hit....and then in the morning, it looked like a burnt sienna, whale piss, brown. My buddy, Will, freaked out. We called the pool people and they were able to restore the normal water in about half an hour. There was actually a dude that's a USMC whore-nut puke that was there too...."Genital" Ben Wilson.