I asked Bob Beyfuss this question last year and he said that it (something like a Ronco dehydrator) worked well for him and others that he knows. Things usually dry in 3 days. He said that the temperature doesn't reach high enough to burn the inside of ginseng. I have seen Larry harding dry some of his stuff on the Ronco type dehydrator in the warm room where he dries the rest of his sang, but he puts a large space between the heating element and the ginseng tray. I used a Ronco dehydrator last year, and put some \"spacers\" between the heating tray and the bottom ginseng tray, as well as remove the top cover so to keep temp low. It worked well, but I am preferring to slowly dry them now naturally over a month, using...Ronco trays, spread out without heat. The appearance of heat dried vs. room temp dried may be different. I believe there may be more vertical wrinkles in the dehydrator, but that may be an illusion. I think people in Hong Kong may not only prefer a little soil on their sang, they may like that yellow look from drying at a certain (higher) temperature. I don't try to turn up the temperature to get that yellow color as long as I naturally dry them properly. I am the one using this stuff so I am okay with that.