Just ordered 10 pounds of their Bismuth casting alloy from Rotometal's. I use a Lee Production Pot I bought circa 1970 and have used it to cast more lead than an average man could shake a stick at. I want to cast hunting projectiles for use here in California and the enlightened rules say there can be no more than 1 percent lead in hunting projectiles. Other than draining and brushing out the pot I am wondering what I might do to be sure I don't inadvertently add some lead to the alloy? And does anyone know how the Cali wardens check for lead in your cast bullets? Thanks.