ive used miners moss for 8 years on my 4 inch O/U dredge.ive noticed that if you slow down or worse yet, if you stop the enging, the black sand locks up in miners moss and when you restart youe engine, the blacksand wont come unpacked!if you rev the engine up on startup thinking itll bust it lose,you maybe right, but itll bust the gold out of your sluice aswell.i switched over to Veranda carpet by Shaw. itll clean it self out as you go and leave the finest of gold and will never get packed up. i have the Gold Cube and it uses the Vortex belting and i like it in my Cube, the hog mat looks reallt nice but i cant afford to buy it to try out even if its the cats meyooooooooooooooow!im real happy with the Veranda carpet.thanks to Hosers suggestion! on the bright side, the left over miners moss i have works real good as a foot wipe in front of my garage.try it, youll like it!