Tap water will slowly calcify your robot mop

Tap water works until it doesn’t — and by then it’s already done the damage.

The minerals in tap water don’t clog your mop overnight. They build up gradually — thin white crust inside the tank, slower water flow, streaky floors. You might not even connect the dots when the mop starts underperforming months later. Soft-water areas fare better, but “better” isn’t “safe.” Distilled water isn’t a premium upgrade; it’s the cheap insurance that keeps your robot mop from slowly calcifying from the inside out.