Originally purchased to empty "fine" of a pellet hopper. Satisfied for this need. Effective for emptying the ashes of the fireplace, the ash from the boiler. Tested on small rubble of cement and plaster, limited to a small particle size it can go, but a good sweep would have been faster. Not tested in humid or wet exit of a sander style DIY device.
In short, satisfied, the golden rule is to clean the filter as soon as we feel the suction power drops, avoid contortions flexible and not wait until the seal be archi full to empty.
