Hi everybody! I am looking for some information about reducing algae and bacterial growth in process baths. In the last few weeks, I've had several engineers propose some rather nasty chemicals they wanted to add to either gold baths, or photodeveloping baths to stop algae from growing. Does anyone else have this problem? What do you use? Do you have any concerns about pass-through to your POTW? I talked to some guys from DuPont at IPC Expo, and they weren't too concerned about pass-through. However, they were selling photochemistry also!! (Sorry about that, John Lott. I had to get that in.) I would appreciate any information, abuse, snide comments, etc. John Sharp Merix Corporation Forest Grove, OR Operations 503-359-9300 (ext. 5-4351) 503-359-1040 FAX [log in to unmask]