Tap water in your robot mop means limescale, white marks, and a shorter lifespan

Tap water seems fine in a robot mop until the limescale starts building up inside the tank and tubes, eventually blocking water flow and leaving white mineral deposits on your floors. In hard-water areas this happens fast enough that the difference between tap and distilled water becomes obvious within a few months — and the repair cost for a clogged mop system is way more than the price of a jug of distilled water.