Pets

To get fleas, it helps to use a combination of sodium bicarbonate (baking soda) & sodium chloride (salt).
Salt & baking soda have different adsorption mechanisms for moisture which helps the powder stays loose.
Also, the salt, at the slightly elevated pH infiltrates the fleas & eggs by diffusion. That throws of the electrolyte balance, so they die sooner, reproduce less efficiently, and prevents most eggs from hatching.
Since salt is essentially harmless, it's a good safe addition that won't hurt your pets.