According to another piece I saw on this [0], the reaction products are ethylene glycol and terephthalic acid. Both of those are useful industrial chemicals, t

According to another piece I saw on this [0], the reaction products are ethylene glycol and terephthalic acid. Both of those are useful industrial chemicals, though not things you'd want to eat yourself. ETA: The Gizmag article characterizes these chemicals as "environmentally harmless", which might be a slight exaggeration. I wouldn't be surprised if terephthalic acid turned out to be an endocrine disruptor, given its benzene ring. But neither chemical is acutely toxic. [0] http://www.gizmag.com/pet-enzyme-plastic-waste/42262/ http://www.gizmag.com/pet-enzyme-plastic-waste/42262/