spyd link said:According to the MSDS it contains tin and copper dust. It is the copper that raises the concern. However, I think Chemipure might be a good idea to run. It will take a long time to breakdown in your tank so I don't think you have to worry too much. Try your best to find it if you can. Unfortunately, there is nothing magnetic in solder. Depending on the tin that they use (white or grey), there may be a slight chance that using a magnet to find it may work, but highly unlikely.