While running a gutter sluice, you can actually catch more gold than a store bought sluice.... if you're careful. You can also loose much more gold than someone with zero experience and a nice keen sluice. Thus, it's all about trying to classify material before sluicing, which then eliminates cleanup times because you can have two sluices... one for the fines, one for the rouger nuggets.. Both in the same stream, and both fed the same starter material.. the difference being classification and water flow. Slower water flow for the fine sluice and of couse faster for the..... oh, you get it.