Dyson Pure Hot + Cool + Air Purifier Fan

Dyson Pure Hot + Cool + Air Purifier Fan

Does the filter need changed, so buy more of filters?
Or do you clean original filter and return to machine?
How ofter does it require maintaining filter?

Found the manual for you:

https://d3gqasl9vmjfd8.cloudfront.net/a4755a7c-edd7-4ab9-b131-34969644c7b4.pdf