Alternatively, just use a privacy coin and skip all the work and fees associated with using bitcoin mixers. XMR is one of the best options considering the high trading volume and fairly stable price.
There are dozens of privacy coins as XMR which can be used to conceal the transaction so I wonder why most people waste more fees on mixer to make their tranasction private. Converting your bitcoin to XMR before sending out is the same process as using a mixer.