I had not heard of any environmental issues with bead release.
Robin (Foster Fire) makes and sells bead release and is also a middle school science teacher as well so perhaps she can answer your questions.
You might want to do a search of "bead release" and see if any negative comments come up.
I understand it is mostly made from things like kaolin which is a type of clay and although it could accumulate in your plumbing there shouldn't be any hazard to the environment.
I would simply pour it out in my gravel drive myself like I would fire place ashes.
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