Can't unmount a filesystem...

I have a 3 disc linear pool that I'm trying to unmount so I can delete the pool and use those 3 discs as part of a new ZFS pool I'm trying to create. When I go to file systems tab on the left though, it shows the file system as being mounted. However, I can not for the life of me find where it is mounted. I have checked all the common places such as shared folders, home directories, smart tasks, cron jobs, etc and can't find anything. I have even installed the reset permissions plugin and checked the "Shared Folders in Use" tab which is also blank. I'm guessing there might be an old config file from an old plugin I may have uninstalled long ago that is causing this. I hope someone can point me in the right direction Thank you in advance.

Resolved the issue by deleting entries in the config file and fstab