Thanks for all the info and suggestions guys, this should really help out!!! So I have a bit of a follow up..... I've got a line on a 220gallon conical bottom mixing tank for cheap, the hitch is that it was used to mix herbicides on a commercial farm. I've heard that you can rinse the tanks with hydrogen peroxide solution several times and it will neutralize the toxic elements and make the tank useful again. Has anyone heard or done this with success or should I just keep looking?