09/29/2026
Ever noticed a bar with super long draft lines snaking across the room? Here’s why I get a little wary. 🍺
I’m Eric, chemical engineer and commercial brewer. Some venues just have a layout where the kegs sit way far from the taps. That can absolutely be done right, but every b**r line needs regular cleaning to keep things tasting the way the brewer intended.
Here’s what’s going on behind the bar:
1️⃣ Dirty lines build up b**r stone (calcium oxalate scale), yeast, and biofilm. That gives bacteria a place to live, and the result is off flavors like sour, buttery, or just plain funky b**r.
2️⃣ With a long run, you’re not really drinking from the keg. You’re drinking the b**r that was sitting in the line, pushed into your glass.
3️⃣ Long lines hold a lot of b**r, so a proper cleaning means flushing and wasting a ton of product. That gets expensive, which is why I wonder if some places skimp on it.
Most breweries and bars recommend cleaning draft lines about every two weeks, and longer or more complex systems need it just as often.
So next time you’re at a bar with a serious line run, ask your bartender how they clean their b**r lines. It’s a totally innocent question, and it tells you whether you’re getting the b**r you paid for at the right temperature with no off flavors. 🙌
Ever had a b**r that just tasted “off” and wondered why? Tell me in the comments!