My guess is it's CO2 in the beer being released when transferring.
I had that same problem till I got a little pipe clamp that I tighten down when I use the siphon. I got less air and stopped having the other problem of premature loss of siphon pressure.
+2. I used to use a rubber band wrapped around the hose about 10 times, but that was a pain to put on and take off. The solution: I got a little round plastic clamp from AHS for about 79 cents. It clips on easy and snaps right off when I'm done.I had that same problem till I got a little pipe clamp that I tighten down when I use the siphon. I got less air and stopped having the other problem of premature loss of siphon pressure.
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