Short answer: The concentrate is dosed in a controlled and repeatable way by a peristaltic pump from a bag-in-box box or a tank; the water arrives through a separate line and the water/concentrate ratio is established in the reservoir.
How is the concentrate dosed?
The peristaltic pump draws the concentrate in a controlled and repeatable way; the concentrate does not touch the pump's mechanical parts, it only passes through the replaceable pump tube (hygienic). The water is fed by a solenoid valve; the water/concentrate ratio is set according to the configuration (the exact ratio varies by product/business).
Source: Bag-in-Box or Tank
Bag-in-Box: closed, hygienic, easy to change. Tank: your own traditional syrup - you are not tied to a brand. Bag-in-Box filling system →
Installation
It is fitted to your existing machine as a retrofit. Main system: Automatic filling system for beverage dispensers.