DataTables - filter an unsearchable column

Question

I have a DataTables table like this:

id | name | group
---+------+-------
1  | Jump | Action
2  | Hop  | Unused

The Group column is unsearchable. But I want to remove rows in the 'Unused' Group (but they can be added back with a btn click).

dt.columns(2).search('Unused').draw()

This doesn't seem to work.