The adjustable oscillating vibrator and adjustable flow gate controls make this Dry Washer ideal. The large feed hopper can hold up to 2 1/2 gallons of material enabling it production of up to 3/4 cubic yards per hour. It also can be operated with 'yard' type leaf blowers or our own "Vac Pack" system. This super light weight (20 lbs.) concentrator is a snap to set up without any tools and folds into a 11" x 21" x 31" package that can easily be attached to our Deluxe Back Pack (BP4).