When the button is held beneath the handle, water begins to flow and ceases when the button is released; in carpet mode, water flow is increased by a factor of two. I find that the vacuum cleaner's small size, wet cleaning, and ability to catch spilt water more than make up for its flaws. benefiting from: The soft roller and wet cleaning solution are effective. The entrance carpeting was meticulously cleaned and looks brand new; Second, using a wet roller on laminate floors is an easy way to get rid of dust and hair; Thirdly, the trash can can be used as a water purifier. There is a setting for the carpet, and you may keep tabs on the water supply volume manually via the water supply button (supplies twice as much water). Activating the trash can's valve when the vacuum is tilted to one side during operation prevents water from entering the engine (when it is triggered, the vacuum cleaner must be brought to a vertical position, and then turned off and you can turn it on again and continue cleaning.) Told you so: Weirdly, traces of moisture linger unevenly after cleaning hard surfaces; it appears the laminate was not laid evenly, leading us to conclude that it is sensitive to uneven floors. A lot of background noise. Third, it's a bit on the bulky side, so I'd say this is more of a gadget for men.