The safety of water bottles made from polyethylene terephthalate (PET) has been studied by several different groups. One German scientist has published a few studies on the safety of bottled water and found that the amount of antimony was higher in water bottled in PET bottles.
Other groups counter this by saying that the health risk from antimony oxide is very low.
For those of you who refill these PET bottles throughout the day - your risk may well be higher from the bacterial contamination than the antimony oxide.
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