I worked in a darkroom developing dental x-rays...same concept developer/fixer...uhmm...we had to save our developer and fixer in containers and ship them off to a hazardous waste company...although in the early days we did dump the stuff down the drain. I really think it's for the safety of the environment not so much a pipes issue. The exact reason why escapes me, not sure if it was the silver or something in the fixer that was the problem.... Maybe someone else can be a better help than me.....sounds like fun though!

I am, therefore I create.......
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