No. Chlorides should not be used to fertilize your plants. Other potassium salts are OK and available at your garden center.
It depends. When products are sourced outside of the United States you'll see 'Product Of' followed by the name of the country.
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The potassium chloride is healthier for you and your plants.
No. But they are better than using sodium chloride. Sodium chloride will damage faucets and fixtures, and the only way to clean off the the salt residue it to use an old tooth brush dipped in some diluted with water (50/50) CLR and SCRUB...repeatedly and rinse. And if you have copper water lines in your home (those were used in older homes, like mine)...the sodium chloride will eat away at the copper plumbing, causing it to, eventually, leak. And don't forget about your hot water tank...if you use sodium chloride pellets you have to remove the sacrificial anode rod in the tank, because the sodium chloride will eat away the rod (it screws in from the top and needs to be replaced every few years. That job requires you to shut of the water in the house, drain the tank, unscrew the rod using a socket and a ratchet, and replace it with a new one). You should drain your hot water tank every years, anyway...that removes the sediment in the tank, that settles to the bottom.