How to perform a clear water backflush

With the Breville Dual Boiler™, you can brew your own café-quality third wave specialty drinks at home—and to get the best possible results from your machine, regular cleaning is key. While some forms of maintenance can be more occasional, we recommend that you perform certain cleaning jobs after each coffee making session. The clear water backflush is one of those very jobs. Here we demonstrate how to regularly flush the pipes of your machine to avoid a buildup of oils or residual grounds. 
1) Empty the drip tray. 
2) Find the grey silicon cleaning disc included with your machine. Place it into the filter basket and insert that into the portafilter. 
3) Place the portafilter into the group head and press the '1-Cup' button. 
4) Wait 20 seconds—this allows pressure to build. 
5) Stop the shot, discharging water into the drip tray below. 
6) Repeat this 3-4 times.