in general not all air purifiers have charcoal filter to remove the smell

In my experience, no. Air purifiers filter out some particles but human noses are so sensitive that we only need very little of the noxious particles to tell that it smells bad. Even when the air quality detector says that quality is good. You probably need some kind of deodorizer.

Cannot.. u use 10 also cant

Only can trap dust

the most expensive the most bad smell can filter

it also depends on how strong the odour is, if its constantly being produced you throw as much charcoal also no use

get rid of the main source first baru the filters can do their work

Hi bro, wondering what brand u tried?