The salt method works by reversing osmosis. Instead of water flowing into the ich parasite allowing it to remain turbid and stiff like the parasite was designed for, it changes the osmotic flow pulling water out of the ich parasite. Pretty much it crenates the parasites shrinking it. Similar to a balloon going flat. The parasite in this crenated state can not function properly and dies. Fish on the other hand don't undergo this problem because they need to a maintain a 0.9% salt solution in their blood to stay alive. Since we use a 0.3% salt solution to kill ich, water is still rushing into the fish just at a slightly slower rate. The fish still needs to excrete large amounts of water (20-30% of its body weight daily) in order to stay balanced. This is why short term salt use is relatively harmless. Keep the salt in for at least 3 more days though 5 is better to make sure that this ich is definately erradicated. It won't hurt your fish.
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