Also some good ideas and technical paper on caustic etch recovery at: www.eco-tec.com/main/aluminum.htm www.eco-tec.com/pdf/TP-129%20Anodizers%20Recovery.pdf Greg Flynn -- Greg Flynn, Facility Architect NC Division of Forest Resources 1616 Mail Service Center Raleigh NC 27699-1616 919-733-2162 x 210 919-218-4820 cell 919-733-2835 fax