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Seriously?!? -grangerBump, I'm following this! But my two cents are - Aside from MJ as a medicine, anything that is bad for the environment or people is better for what you are trying to do. Pesticides, asbestos, lead based paint, OIL based paint, leaded gas, hell even GMO's. They all have bad things about them, but they do awesome indispensable things.
I have no clue on the ammonia though.... But I will say this, I dumped old aquarium water in a mulch bed.... Bushes died that day.