Anything that you feed your fish should be relatively edible if not totally edible (taste is another thing all together).
For me it wasn't about making it safe, it was about getting the god awful stench out of it. And I have a crazy expensive blend-tec blender so it wasn't like I was gonna toss the pitcher.
I soaked mine in soapy water for a few hours, washed it and then ran it through the dishwasher and it came clean. Hasn't killed me yet so I'd say it's safe.
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