The setup only works when the lemon is cut deeply enough for the salt to reach the flesh. A shallow slice leaves too much of the fruit sealed off, and then the scent release turns weak and lazy.
Cut it into quarters, sprinkle the salt where the exposed fruit can grab it, and place it where air actually moves through the room. Near a doorway, beside a bed, or close to the worst odor source is where it earns its keep.
Most people place it once and forget it. That drains the effect fast, because a dry, exhausted lemon is
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