Diffusion is like LoL
When one salty person falls into a pure group of people, everyone is salty. Also, salt is worst at the bottom (bronze). http://www.feelhealthylife.com/wp-content/uploads/2015/02/Water-and-salt.jpeg
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But if you add flames, the water will evaporate and leave the salt behind so you can remove it. If you flame salty people in LoL, you'll make them even more salty.
You forgot to mention that at the bottom it also tends to be more dense. (Buildup of salt no longer dissolved because of evaporation)