Large bedrock cracks, especially underwater, would be a good application.but I rarely encounter one that can't be scooped out much more effectively. have been suggested and executed - still it is a hard way to get nothing in my experience. Lots of improvements, handles, valves, etc. The general concept IS APPEALING (as witnessed by the huge interest and sales) but the effort and awkward ergonomic aspects will kill you in short order - with very little to show for the effort. The videos showing volumes of material being sucked are a joke. made a piece of JUNK! Also, in general, I have found the larger suckers of VERY limited utility for the prospector. I bought a small one at a prospecting Shop in Prescott AZ last summer because I left mine home. I am sure there are other quality vendors out there like DeserDog who posted here.
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