Why Is My Beer Fobbing?
We get a lot of people who have home bar systems ask us why their beer is fobbing. In most cases, the equipment is fine but the conditions are causing their beer to fiam.
Below are the most common causes and how to fix them.
1. Beer Is Too Warm
Most modern beers are normally served below 5°C
If the keg or beer lines become warm, carbon dioxide comes out of solution which means you get pockets of air in the line.
How to fix it
• Ensure the keg is properly cooled
• Avoid warm beer lines, ideally lines should be chilled from keg to tap
• Use insulation where needed (home bars)
2. Incorrect Gas Pressure
Too much pressure on the keg for the relevant gas mix forces excess gas into the beer line and creates foam.
Typical pressure ranges:
Ensure your pressure settings are correct before you start dispensing.
3. Dirty Beer Lines
Dirty lines create nucleation points which release CO₂ from the beer.
This causes foaming and poor taste.
Beer lines should ideally be cleaned every 7 days in commercial systems with a good quality detergent such as Prosan Ultra.
4. Incorrect Beer Line Setup
Beer line length and diameter affect the flow restriction. We usually reduce the line size to the back of the tap with 3/16" line.
If the line setup is wrong it can cause:
• excessive foam
• slow pouring
• flat beer
Need the Right Equipment?
You may need to check parts of your system:
• CO₂ regulators
• Beer line cleaning kits
• Beer line insulation