Hi All-
Has anyone ever noticed a mark within a glass fermenter that comes back regardless of cleaning or sanitizing? I attached a picture of a cloudy white circle inside my demijohn. This thing comes back year after year regardless of whatever cleanser, sanitizer, or carboy brush I use. I haven't noticed any adverse affects- the wine in this demijohn doesn't taste any different than any other demijohn that I have, but I'm perplexed as to what this is. It only shows up when the inside is dry, its not visible when wet. Picture attached.
Has anyone ever noticed a mark within a glass fermenter that comes back regardless of cleaning or sanitizing? I attached a picture of a cloudy white circle inside my demijohn. This thing comes back year after year regardless of whatever cleanser, sanitizer, or carboy brush I use. I haven't noticed any adverse affects- the wine in this demijohn doesn't taste any different than any other demijohn that I have, but I'm perplexed as to what this is. It only shows up when the inside is dry, its not visible when wet. Picture attached.