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I tried putting two extremities of a 6 volts battery into water. With salty water, bubbles appear close to the positive end.
With unsalted water, what looks like a thin white foam starts to squirt from the positive and and moves through the bottom of the glass.
What am I seeing there?
You are seeing the Electrolysis. Namely, separation of water into hydrogen and oxygen. Salty water is conducting better than a non-salty one, so you see a stronger reaction in it. But the non-salty one is still impure (it still has some minerals dissolved), so some conductivity exist in it too, but the reaction is weaker.
