Remove duplicate rows

I had a .txt file with 6571 rows and 250 columns

The account numbers in the Account_Number column were flawed and I had to fix them using some transformations.

But at the end the OLE DB Destination where I populated a table I can see 9004 rows.

I used select distinct on the account numbers to see the destination table and it seems the rows have repeated because of repeating column numbers.

what transformations can I use in SSIS to get rid of duplicate account number rows?

Dhananjay Rele