There are also pictures on the packaging of our replacement cartridges.
Basically you get the old filter off, put the new filter in water for 5 mins, put it in the jug, pour water in and dispose, repeat procedure and you are ready to go. Press the start button when you've replaced the old filter and the indicator will show a blue flash light. After 30 days it will show a red light which indicates the filter needs to be replaced. Or you can calculate yourself... it last about 150l worth filtering.
For any questions please do get in touch.