Frequently Asked Questions
Which water tank do I fill and which do I empty?
Fill the clean water tank with fresh water, and empty the dirty water tank after use – similar to a sink with a clean side and a drain side.
How does the two-tank system work in a robot vacuum dock?
The dock automatically fills the mopping pad with clean water from the clean tank, scrubs away dirt, then drains the grimy water into the dirty water tank so the pad is rinsed fresh for each cycle.
Why is a separate clean and dirty water tank better than a single tank?
A two-tank system prevents your robot from mopping with the same dirty water it used on other floors, ensuring floors get genuinely clean instead of just redistributing grime.
How often do I need to empty or refill the tanks?
You only need to empty the dirty water tank after use, while the clean water tank may need refilling periodically – no constant manual refilling is required.
The bottom line
The clean and dirty water tank system is brilliant once you understand it: clean water in, dirty water out, fresh floors every time. It removes the guesswork from mopping and keeps your home hygienically clean without manual rinsing. If you’re buying a robot vacuum with auto-mopping, this feature should be at the top of your wishlist. If you’re on a tight budget and don’t mop often, a simpler model without mopping might be fine. But for most people who want a truly hands-free home cleaning solution, a vacuum with separate water tanks is absolutely worth the investment.