How does a water softener no salt works?
Some websites, like the one I linked to, refer to them as "water softener no-salt," but that's a stretch. We think of softening as eliminating hardness from water, but in a no-salt water conditioner, you don't take anything from the water; the water going in and out has the same hardness. The only difference is that the water itself is treated to prevent scale formation.
Template Assisted Crystallization is how it works, at least in the most frequent kind that appears to function the best (TAC). That is to say, there is a template and a type of structure, and when the minerals in the water collide with it, a sort of crystal develops. They're nano-sized crystals that float around in the water and are completely safe.
You're generating calcite crystals, which can't form scale. They don...