After some excellent feedback from users in the field we have redesigned our concentration bowl to prevent "blow outs" when running certain finer materials.  In our testing of the new bowl we achieved a true 99% recovery of our flour gold sample. Our testing was confirmed by comparing the amount lost in our overflow to that which was captured in the bowl.  Specifically, we found an ~ 1500 specs of flour gold in our bowl and only 12 in our overflow.  With all this being said though we do realize that results may very depending on the specific type of material being run.  We look forward to hearing from those that have or will soon have the new bowl.  All Gold Rush Nugget Bucket kits sold after August 28th have the new bowl.  For those that need only the new bowl we sell them individually on our website for just $10 which includes free shipping anywhere.  Below is a picture of the new bowl.  Thanks all for your support and valuable feedback as we perfect this new tool!  Cheers, Gold Rush Nugget Bucket, Inc.