Bottles are sent to a sorting centre where they’re separated into three different types of plastic – PVC, HDPE and PET, and then squashed together into large blocks. From there they're taken to a reprocessing plant where they’re separated into individual squashed bottles.

Each bottle is washed to remove labels and dirt, dried, then ground down into small flakes. The flakes are melted and squeezed through tiny holes, through which molten polyester emerges. As it solidifies it’s cut into small pellets which are then stretched to make thread. The thread is knitted to produce a roll of fabric, which is dyed and used to make clothes.