So recently news broke about there being plastic particles/contaminants inside major brand water bottles (plastic), so since I don't drink bottles water but use some plastic bottles myself to fill in some fresh water from the local forest I then wonder how did the plastic particles got in the bottles in the first place? Is that because of some sort of mechanism used in the bottle fill up or are those particles coming from the bottle itself, and if so do they continue to accumulate in used plastic bottles that have been filled and emptied many times before, as in my situation? http://www.bbc.com/news/science-environment-43388870 Above all I am not that well versed in chemistry but how dangerous it is exactly to have some minor amount of ordinary plastics like Polyethylene and others digested in the body? I read in other places that those particles aren't absorbed due to their different molecular weight and chemical properties unlike those of food and so get largely extracted out of the body and don't accumulate. some expert opinion on this matter would be welcome, thanks.