On 3/3/10, Godfrey DiGiorgi <[email protected]> wrote: > > Fixer has small amounts of sodium thiosulfate in it, which is > typically used in pesticides, etc. California doesn't even list it on > the toxicity pages. However, exhausted fixer has small amounts of > silver salts in it, which are heavy metals that are pretty reactive.
We discussed this a couple years back and there was a link to a document with some nifty mathematical/scientific data that claimed most of the silver thiosulfates become thiosulfides in the sludge on the side of the pipes somewhere between the drain and the treatment plant. I used to dump mine into a septic system and never noticed any problems, but I was probably developing 6 or 12 rolls a month. Now I'm on the city sewer system and it still goes down the drain. -- Scott Loveless http://www.twosixteen.com/fivetoedsloth/ -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
