Two water tanks keep your robot from mopping with its own filth

A single-tank mopping robot is basically dipping a mop in the same bucket of dirty water over and over — it spreads grime around more than it cleans. A two-tank system keeps clean water separate from the wastewater it collects, so the mop pad is always being rinsed with fresh water. It’s the difference between mopping your kitchen floor with a fresh bucket versus water that’s already picked up yesterday’s coffee drips.