You can change your refill using the following simple steps:
Step 1) Remove lid from your original bottle.
Step 2) Carefully twist the reusable pump to detach the outer sleeve.
Step 3) Unbox the new refill cartridge and remove the cap and foil seal.
Step 4) Recycle your used cartridge and cap together in your household recycling.
Step 5) Lastly, screw the reusable pump onto your new cartridge. Reattach the outer sleeve and lid.