I just put some "Party Blue" that I had into the pool to see how fast the diffusion would be. This is a dye that makes the water blue and it breaks down in a couple of days. I put it into the pool over the jet at the deep end and within a couple of minutes the deep end was pretty much filled in with blue. Then, the blue reached the bottom two drains as well as the skimmer and the blue dye started to come out of the shallow end jets. After five minutes, there was blue everywhere, though it was much darker in the deep end (even accounting for the greater depth).
After 15 minutes, it looked like the entire pool was filled with the dye and it has not changed in color since (after an hour), so the diffusion (at least of dye) seems pretty darn fast. Perhaps have your neighbors get some of this stuff to put into their pool -- the visual effect is pretty convincing!
Richard
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