A plus: the sucker can suck everything a classic industrial vacuum cleaner also can. So mortar residue, soil, wood residues and everything is incurred in our house during the renovations, even liquid - in small amounts (beer from the bottle, I can not test, because my brother was always in sight)).
Of course, the laws of physics will not be able to override. This means that the finer the aspirated material, the more often you will have to clean the filter. Say: Lightly tap directly into the dustbin. Of course, * not * in the house, or the wind, or near other people, or to the house wall.
On the amount of dust trickling down when knocking the way you can measure how effective such a filter.
Therefore: 5 stars.
