The amount of silver in used fixer is relatively small, and silver tends to precipitate out, used developer is probably a bigger problem, it contains silver nitrate, which is still used medically as an anti-biotic. Enough will "kill" a sewage system. Still you'd have to be running a commercial operation for that to really be a problem.
Rebekah wrote: >> I don't think it's such a good idea to pour used fixer down the drains. >> Silver is a cumulative toxin like mercury. >> > > Where would you take it then? I've heard that lots of places that > "dispose" of liquid waste like used oil just pour it down the drain > too. Is there a way to check? > > rg2 > > > On 9/7/07, John Sessoms <[EMAIL PROTECTED]> wrote: > >> From: >> Scott Loveless >> >>> Next is fixer. Depending on the film and the age of the fixer, it >>> usually takes around 5 minutes. This goes back into the bottle, too. >>> As the fixer depletes it will take longer to clear the film. So keep >>> an eye on it. There are quite a few methods for determining fixer >>> strength. When the fixer takes more than 10 minutes I dump the bottle >>> and mix up another gallon. My only exception is with T-grain films. >>> Any fixer I use to clear T-Max or Delta films goes right down the >>> drain. Those films deplete the fixer more than traditional black and >>> white, such as HP5 or Plus-X. >>> >> I don't think it's such a good idea to pour used fixer down the drains. >> Silver is a cumulative toxin like mercury. >> >> >> -- >> PDML Pentax-Discuss Mail List >> [email protected] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> >> > > -- Remember, it’s pillage then burn. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
