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When a user deletes a page from a Confluence space, the page is not permanently removed. Instead, Confluence places the deleted page into the 'Trash'. The page will remain in 'Trash' until a space administrator purges the page.
Purging deleted pages permanently clears them from 'Trash'.
You need to be a space administrator to purge deleted pages for a space.
To purge deleted pages:
If your space is using the Documentation theme:
When the trash is purged, all attachments on purged pages are permanently removed as well.