First let me say, I'm new at this and only doing it as a hobby. Reading the instructions on the back of my 16oz bottle of "PCB Etchant Solution" (Ferric Chloride) from Radio Shack. The last line reads: "Discard unused solution into toilet bowl and flush" I prefer to reuse it a few times before discarding, it does loose its strength requiring longer time to etch. I agree with Roman, drain cleaners and even household cleaners, etc.. are more harmful if for no other reason the concentration. If your household waste is NOT sent to a treatment plant (i.e. septic system or nothing at all) then you should be concerned with the volume and type of other household chemicals besides the odd few ounces of etchant solution. Malcolm ----- Original Message ----- From: Roman Black To: Sent: Friday, March 23, 2001 12:48 AM Subject: Re: [OT] Disposal of used PCB fabrication chemicals > Chris Carr wrote: > > > By putting it in sealed containers and calling an authorised waste disposal > > company. > > > > >I just want to make sure the drainage pipes in my or the > > > neighbours' houses won't get harm! > > > > > > > Of course the Sewerage Plant and the Environment into which these chemicals > > are discharged does not matter. > > > > My advise is always dispose of chemicals properly and that invariably means > > never down the sewerage system. > > > Umm, just a thought, isn't "Draino" and other sink/drain > cleaners more corrosive than the usual pcb etchants? > Sure burns your hands more. Once you dilute it a few > times with a little tapwater it is less corrosive than > say lemon juice or vinegar. An acid or alkali is not > as bad as other toxic substances. > -Roman > > -- > http://www.piclist.com hint: PICList Posts must start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics