It is the best of all of the battery powered gravel vacs to have. And gonorrhea is the best of all venereal diseases to have. I would think you'd be better off with neither!
Zig, I know it says it catches the debri in the filter thing there but I would think that at least some mulm would come out making the water cloudy.In my young fishkeepping days before coming to AC, I used a vac too that captured the debris in a bag.... which made more mess than it was worth.
i don't think that thing will actually suck up the small particles.....i just use airline tubing, a turkey baster, and a thin steel rod
put the still rod(at least 10" long) into end of airline tubing, hold the thing and point wherever u want to clean up, then start the siphon by using turkey baster at the other end, i'd do it with a WC as it takes out water while u take out all the "crap".