These are at least 5 years old, we don't have the jug for these anymore so no use to us. There are 5 sealed filters inside the box (one missing). There is no use by date, but some kind of batch number, unsure what it means!
According to Google these are unlikely to be harmful but may have reduced effectiveness over time so use is at your own risk, thanks.
Water filters (Kennington OX1)
This offer has been gifted to someone and is no longer available.