The Ilfochrome bleach is toxic and usually requires specific treatment before discharge e.g. in drains. The lab where I had my prints made had an exotic waste treatment facility to comply with EPA standards as the lab was smack-bang in the middle of residential suburbia and early odours coming out of the place caused a few stirs.
I used to print it in my darkroom and Cibachrome's suggestion was to mix the chemicals together to neutralize it. I've heard Ilfochrome or Cibachrome will wreck your plumbing if you don't dispose of it properly.
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