Recommend using CU OX-310 Sodium Chlorate solution in place of Chlorine gas for copper oxidizer .Also , Chemcut 907 regen system is an easy conversion for this process. Mike Covel HMSC ______________________________ Reply Separator _________________________________ Subject: [TECHNET] Cupric Chloride Etchant Author: "TechNet Mail Forum." <[log in to unmask]>, at CCGATE