Peter van der Weerd of www.kafko.nl added a dual opv feature to my espresso machine a while back.
I used to have it on 4 & 9 bar but after reading about the upcoming new LONDINIUM L1-P which will have an advised line pressure pre-infusion pressure of 2 bar, I decided to play with a low pressure pre infusion on the Rocket as well.
The result of the first two cups is very promising, a soft and creamy quality to the Indonesian beans I used. Time and experience will tell me more.
I used to have it on 4 & 9 bar but after reading about the upcoming new LONDINIUM L1-P which will have an advised line pressure pre-infusion pressure of 2 bar, I decided to play with a low pressure pre infusion on the Rocket as well.
The result of the first two cups is very promising, a soft and creamy quality to the Indonesian beans I used. Time and experience will tell me more.