Works with or without the filter 1 filter = 300 single serve plastic water bottles Dishwasher friendly Wide mouthpiece for faster flow The very best bobble ever 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.