How to adjust grind size

Performing a group head purge to clear the filter basket is simple. Please be sure the portafilter and filter basket are cool before cleaning them. 
Rinse them both in hot water, scrubbing with a gentle brush. You may discover some of the filter holes are blocked. In that case, follow the instructions about using the cleaning tablets included with the Oracle® for an extended soak. 
After cleaning the portafilter and filter basket, rinse and dry both, thoroughly before reinserting them into the group head. Now you're ready to make your next cup of great-tasting brew.