----- Original Message ----- From: "Scott Loveless"
Subject: Re: Developing Chemical Disposal
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.
I looked at what was in my dishwasher detergent and decided that a couple of gallons of photochemistry a month wasn't going to hurt anything. If you choose old school chemistry (sans Metol is possible) or X-Tol (or similar) as a developer, there just isn't anything in the process that is going to cause anyone any grief at all. I read a report one time about the allowable amounts of silver that could be dumped by labs in California. Apparently the tap water in some areas had more dissolved silver than what was allowed to go down the drain. It's good that people are becoming sensitised to what they are pouring into the sewer, but I often think that there is an over reaction regarding it as well.
William Robb
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