In Excel, there are several ways to filter for unique values—or remove duplicate values:

To filter for unique values, click Data Sort & Filter Advanced.
Follow these steps:

Select the range of cells, or ensure that the active cell is in a table.

Click Data Advanced (in the Sort & Filter group).
In the Advanced Filter popup box, do one of the following:

To filter the range of cells or table in place:

Click Filter the list, in-place.

To copy the results of the filter to another location:

Click Copy to another location.

In the Copy to box, enter a cell reference.

Alternatively, click Collapse Dialog Button image to temporarily hide the popup window, select a cell on the worksheet, and then click Expand Button image .

Check the Unique records only, then click OK.

To highlight unique or duplicate values, use the Conditional Formatting command in the Style group on the Home tab.

I hope this is helpful!
Tim Paine