I want to mention that all these indoor air purifiers of 30-40 cm have a small pump that makes a lot of noise.
Although it is not nuclear physics, by placing a small sponge between the pump and the bottom, you solve your problem 100%.
Otherwise, it is simply UNBEARABLE!

Beautiful grinder, a little smaller than I expected (especially for its price), but that's my fault, it clearly states the dimensions.
The real issue is that its motor makes noise, it's like having a buzz in my living room when there's no other source of sound to cover it. It's not powerful (the motor is quite small). Think of a fly. Particularly annoying in a quiet environment, but the worst part is that you can't hear the water at all. It's because the casing is lightweight (as it falls controlled by the 4 valves, in combination with its small size), and you also have the motor buzzing, you can't hear the water.
If I could go back, would I buy it again? No, and definitely not for the price they're selling it. I would pay a maximum of 20 bucks.
But it's very beautiful and visually adds a nice touch to the space.
Also, the "instructions" it comes with are terrible. It doesn't explain how to connect it, and if you're not familiar with electrical stuff like me, you have the anxiety that you might break it until you see it light up.