A dear friend gave us a Brinkmann Gormet Electric Smoker, and I am dying to use it! I "made" a smoker that I have used for the past 5 years out of an old Gas Grill . (Took all the guts and stuff off and out, and use Charcoal) I'll have to post some pics later. My question is, it says to put LavaRock in the Fire Pan where the heating element is, can I go to a Garden Center and get some LavaRock, or does it need to be 'made' for use in a Grill? Does the LavaRock help maintain Temperature? Have never used a Electric Smoker, so not sure just what I'm doing, but I have read the "Instructions" a dozen times, and am now going thru the Forums for other ideas..... Thanks for your help!