I've had a little trouble with carbonation after bottle conditioning lately. A few consecutive batches actually. I have started replacing items such as my bottling bucket, hoses and the like. I'm down to my glass carboys as a suspect. I sanitize them with Star San and let them dry, I don't rinse them as per the intsructions.
A rep with 5 Star came to one of our homebrew club meetings and explained that letting the Star San dry will form an active anti-bacterial barrier that will for a while provide protection against contamination while the carboy is empty. I seal the carboy with a cap for the week that it is not in use, however, I have not been rinsing it before transferring my delicious beer into it. I'm wondering if the "still active" Star San is hindering my yeast and that is why my beer is not fully carbonating. Any thoughts? Any experience? Should I look at something else as the culprit?
I have since started rinsing out my carboys so I will know pretty soon if this fixes my problem but I'm just curious if any of you have any thoughts.