I read online that it is possible to take part in a free tour. Does anyone know where i can book this?

Go there during the weekend, gwt in the line at the entrance. You will be asked if you want to take the tour, if you say yes, they will give you a free entrance ticket for the next one with availabilities (every 30 mins). Enjoy!!!

Is not possible to book the tour, you have to pass by the place.

The tour is free, but the beer is not.