I never thought about that, but finally it's more environmentally friendly as fertilizer (laughs) now, to use as they do in brewery, I guess there are a lot of precautions that are taken. By cons, I will not use it as fertilizer for my houseplants ^^
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Well, it is good if used with moderation and according to instructions, but so is every fertilizer or pesticide (natural or man-made).
Thank you for reading! :)