thats dredgers buying them for black sand removal. 
that pump should work. i bought a similar pump from max tool ,that was a 3" in 3" out ,i put a bell reducer on it to 2" out .also mine was not a high pressure ,and it works great ! better than before.that sucker ever gets a good sized rock with your hand in the way ,you'll know it !!!!!!!!!! but here's the problem with mine.it's a lot heavier,so i had to moved my pontoons forward.about 6"or 8".........but works great.......the one you found looks to be lighter. ,high pressure ,and overall probably a better match .next one i buy will probably be the one you found.......it would be easier on my back when moving it around...........
efret said:
honestly i don't remember ,but i bought it from max tool .3" clear water pump. it works really good ,except too heavy. but for $200 it was a quick fix,it has already paid for itself.and a little extra ! i will try to copy the specs from their site .the pump you are looking at would probably be better.
........ wow that would surely increase production. 
