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I tested a robot vacuum that mops with recycled water and the results surprised me

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ZDNET's key takeaways The 3i S10 Ultra robot vacuum and mop is available for $1,900.

This device features a unique innovation: a trademarked WaterRecycle station that distills wastewater and dehumidifies your home so you never have to refill the clean water tank.

The full device is one-of-a-kind, so its settings and setup take some getting used to, and it can sometimes take a long time to finish a task while the water distills. $1,899.99 at Amazon

The 3i S10 Ultra robot vacuum and mop is on sale right now for $1,299, a $600 discount.

As someone who reviews robot vacuums, I honestly thought I'd seen it all, especially after the launch of the Roborock Saros Z70 with a mechanical arm. But the 3i S10 Ultra came along to keep me humble.

Also: I let this Nvidia GPU-powered robot vacuum clean my home for weeks - here's my verdict

This isn't even a brand-new robot vacuum and mop -- it was launched six months ago in November 2024, but I hadn't heard of it until recently. And when I learned of its WaterRecycle system for the mopping feature, I knew I had to test it. Yet when the robot arrived, I was even more surprised at how different an experience it offered.

I've come to know robot vacuums inside and out. I'm a fan of these smart devices and have seen them evolve greatly over the years. I set up at least a handful of them in my house each month, so very few of them are able to stump me. The 3i S10 did just that.

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For starters, the 3i S10 Ultra is the biggest robot vacuum I've seen. Most top-tier robot vacuums delivered to my home weigh between 30 and 49 pounds, but the S10 Ultra is a hefty 80 pounds. The charging dock is like a fancy mini-fridge, and it is an appliance in its own right. 3i packs a ton of technology within the station.

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