4 ms·

Or perhaps if they were exposed to heat, oxidation, or physical stress even (dropped, squeezed, overly pressurized)

• reroute1 7y ago
  This was the story I had heard years ago, that they are left in the heat/sun and the plastic of the bottles can melt into the water.
• lostlogin 7y ago
  > overly pressurised It would be interesting to compare carbonated versus uncarbonated.