They are correct, but make sure you take a big dump before you flush it down!
The water softener uses a resin bead (small plastic beads) that the house water passes through. The calcium and other hardness components are captured by the resin beads as the water passes over them. The softener salt is used to flush the hardness materials off of these beads. The salt is not added to the house water. The house water is bypassed and the salt solution (or brine) is passed over the beads, releasing the calcium. The beads are then flushed with water to remove the salt. In this process, a small amount of salt may remain on the beads and therefore get mixed with the house water, but if the water softener is working properly, virtually no salt remains. The entire process is called regeneration. I would not worry about the amount of salt in the house water.
Using water softener salt in pellet form would be very inefficient for melting ice on a sidewalk. Small particles of granulated salt would work much quicker for sidewalk application. In addition there is a safety concern walking on large pellets
No your system will spontaneously combust. Major eye roll. Its salt. Use it.
I would search or contact the manufacture. Salt is not salt and gas is not gas. I don't recommend asking people who don't know what they are talking about.
sodium chloride will kill lawns. not sure about potassium salt. however, hopefully your piping system does not use soft water in any case to water plants and lawns. That would be a big waste of money. correctly piped homes have separate pipes for outdoor spigots with untreated (hard) water. not issue using hard water for watering outside.
Yes, Morton Clean and Protect is formulated to be used in all water softener units. Be sure to check with the unit owner's manual for best recommendation.
No smell when used with well water in Oregon or hard as nails community water in Arizona.
yes it works with all water softeners