Conditioning and filtering

At the end of fermentation, beer lacks only two qualities: Its taste is a little "young" and it lacks brilliance. The conditioning and filtering correct this.


The conditioning takes place in large metal tanks at low temperatures and can last between 15 days to three months. This serves three purposes:

  • the "young" taste is replaced
  • the yeast settles slowly, which gives the beer its polished and brilliant aspect
  • to provide carbon dioxide via the second fermentation


The Filtering. As soon as the brew master decides that the beer is sufficiently "mature" and ready for packaging (this applies only to crystal clear beer without yeast deposit), it is filtered to remove the remaining yeast and any solids.

White beer, such as Wittekop is not filtered. Therefore it is cloudy, opaque and has  yeast sediment (rich in vitamins). Other beers are partially filtered to keep a small amount of yeast in the bottle.

test qualité quality test during conditioning

soutirage jack hammer BrewDog Jack Hammer coming fresh out of botteling


Packaging and conditioning in bottles, casks or cans has become a highly automated process. The role of the highly specialized staff is limited to monitoring the operations of the production chain and to only intervene in emergency situations. Machines extract the bottles from the dirty beer cases, put them into a machine that washes and sterilizes them. The beer cases are automatically washed and prepared to be filled again. The clean bottles are transported to the bottling machine and then sealed with caps. Then the bottles are labeled and transported to the packing station where they are put into the clean beer cases.

Some companies will put a small quantity of yeast into the bottles before they are filled. This will start the bottle fermentation (e.g. triple fermentation). The beer will become more sparkly and its taste will evolve. This means that two bottles of the same beer may differ in taste and, more importantly, you can store it the same way as you do with good wines!