Why is it hard, and costly to remove salt from water?
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The main problem is that salt mixes with water. If you put sand in water you can simply wait for the sand to fall to the bottom of the vessel and then simply scoop up the water (without shaking the vessel).
Why is salt more special? Well, it’s mainly because it is “soluble” in water. What this means is that a water molecule and a salt molecule stick together, as if they are holding hands. Imagine how harder it is to separate two persons holding hands (water and salt) to separating two persons simply standing next to each other (water and sand).
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