Hi Folks, Looking to do a plumbing project requiring soldering in the potable water line. Last time, long ago, I used lead solder and mercury flux - worked great! Some time back I used non-lead solder and the stuff was terrible - wouldn't melt. So, tell me what I should use for non-toxic soldering. I see non-lead solder, same but with acid core, and silver solder. I see flux with zinc base. What is the best (read does the best job)? Thanks.