Julie, You must be soldering bare copper/OSP boards if your getting copper contamination in your bath. There is not much you can do about it but the contamination will build up quicker in small solder pots as opposed to the larger (1000 lbs +)pots. If your not soldering copper boards then start looking for the person that is throwing pennys into the bath. (Yes, I have seen this happen) If you have any doubt about the solder your using then you should have it analysed by someone other than your vendor. Ken Kirby (Embedded image moved Julie Dixon <[log in to unmask]> to file: 10/07/99 01:59 PM pic06352.pcx) To: [log in to unmask] cc: (bcc: Kenneth Kirby/ElectrovertUS/Cookson) Subject: [TN] HASL-contaminated solder pot TechNet, We have sporadic problems with the copper level rising in our solder pot. We reduce the temp and dross each morning. Could you recommend a specific PM program to keep our SnPb clean? We believe per the certicates of analyses that our supplier gives us good product. Any other reasons it might rise? Thanks, Green ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################