Do the filters need replacing, if so, how often?
Yes the filters do need replacing.
1. The effective working life of the City™ filter depends on a number of factors, such as; the breathing rate of the user; ambient levels of pollution; the length of time the filter is actively working; hygiene levels. Taking these factors into account we recommend that the filter should be replaced every month or every 69 hours, whichever is sooner.
2. Replacement of the Sportsta™ filter should be carried out every month or when the filter becomes noticeably discoloured.
For more FAQ, go to Respro® Mask FAQ
Respro® Masks are reusable 
Respro® Bulletin Board 
Hi Sophie. Thanks for answering me. I do understand it will need replacing. So I am guessing then you can’t wash and reuse?
Hi,
Our masks are reusable and the filter can be gently washed: https://respromasks.com/cleaning-your-respro-filter/
You can find more information about filter lifespan here: https://respromasks.com/2020/04/27/cleaning-and-replacement-of-respro-filters/
Hope this helps!
For any other enquiries, please email our customer services team.
https://respro.com/contact