I think that it is sanitary because it can be squeezed without using hands. It is the same for other types of bucket etc, but I think that it is a difficult point to easily leave dust in the corners of the inside.
I used several mop squeezers of unknown makers, but I think that I could find a decent thing for the first time. Things that I used until now, although I tried hard, I could only squeeze the water dripping, but this can be quite squeezable.
I have been using the same manufacturer's products for some time. Although I am using it to do the floor cleaning, I did not last long because I used some chemicals, but it is watching how much this different type has.