bobble Plus has been created as the very best bobble yet! Filter or Infuse with bobble Plus, you choose. Simply use the bottle as a filter bottle by adding the included carbon filter to the cage, or remove the carbon filter and add your favourite fruit into the bottle to Infuse your water. A wide mouthpiece means that bobble Plus has a faster flow and it's made of Tritan plastic, so it's dishwasher friendly. Replace your filter every 3 months.