Air bubbles in bottle filler tube

[MichaelM]

I've been having this issue ever since I've been bottling with the bottle filler. I fit the tube onto the tap of my plastic fermenter (standard 30l ampi fermenter). It is a bit of a tight fit and needs to some forceful adjustment to get it to slide over the spout. When I start filling the bottles bubbles seem to start developing at about 1/3 of the way down from the tap. I've tried adjusting the tube but can't seem to get rid of the bubbles.I've tried with a better fitting tube and it still happens.

Does anyone else have this problem? What have you done to stop the air entering the tube?

Thanks

 

[MHB]

Air probably isn't entering the tube, certainly not a third of the way down its length, its more likely to be CO2 coming out of solution. Remember that the green beer is a saturated CO2 solution at the temperature its been fermenting at.
As the beer is falling down the bottling tube it is probably forming a very slight vacuum, the biggest cause of breakout (bubbles forming/foaming)
Most bottling tubes have a valve on the foot, if it was sucking air in, with the tap open when the beer wasn't flowing beer would be leaking out.
Mark

 

[peteru]

Chilling the beer before bottling can help.

Let's say you fermented at 19C. Cool the beer to 6C before bottling. The problem should go away.

 

[Grott]

If you can't cool your beer down in the fermenter can you post a picture of your set up as you really should not have a problem in the filler tube.

 

[MichaelM]

Thanks guys. Makes sense that it's co2 bubbles and probably not air. I'll try cooling it before bottling to see what happens.