Doc, as far as I've watched, is kinda close as to exactly which mix of mats he uses in his sluices. I'm building a "copy" of his 8" wide multi-sluice - only 60" long. This allows 3 "zones" of 18" (3 sections of 6" wide mat - for example) that will be swappable - to test the recovery rates of Gold Hog against other kinds of sluice materials. Miner's moss/expanded - then Gold Hog - then carpet/riffles. 3 Gold Hogs - then 3 different ones - then 3 of somebody else's, etc. etc. What 3 Gold Hog mat flavors would you recommend to start based on your experiences with Doc's delivered products so far?