Picture a bouncer at a club, but for your water pipes. The filter sits at the inlet of your tankless water heater and changes the chemistry of the minerals, so they don’t clump together. Instead of forming hard, sharp crystals that stick to your heater, they turn into soft, harmless micro-particles that just wash away.
It’s like giving your water a chill pill. You don’t remove the minerals—you just make them behave. You still get the health benefits of hard water (hello, strong bones), but without the nasty side effects.