HT201949 What is a good SSD free space wipe application?

I recently recovered an amazing amount of "Deleted" files from my Macbook running El Capitan on an SSD. According to an article on this board, that should be very difficult. Well it's very easy using a basic app I found. Any suggestions for a wiping the free space on my MAC since Secure Delete is not an option in Utilities?

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If you what to have the data from free space be unrecoverable on an SSD then use FileVault to encrypt the data. Once you do that the free space is encrypted and unrecoverable without the FileVault passkey. When you are getting rid of the SSD just reformat that removes the key from the disk render the data unrecoverable forever even with the key.

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