I know two guys that are having issues with their beer having aldehyde. 4 batches, 3 diff dry yeast strains. I was theorizing that it could be temp issues. They just started using a freezer with a temp controller. I thiink the temp is set at 17c.
They don't have fans in the freezer. Could the bottom of the kegs be getting to cold? They sit right on the bottom of the freezer. No spacer or anything. I believe their temp probe hangs in the middle.
Freezer is a small one. Holds 2 glass carboys.
Their first batch was to young and the second used the same yeast (S-05) so I thought it might have been either to short a fermentation time or yeast quality issues, but they aged the other beers a decent period and used windsor and s-04 for the last two beers.
The aging helped but their is still some aldehyde in those last to beers. The FG's seems within range and did not change after a week. I will note that it did take some time to finally arrive at the FG. Dropping from say 1.030 to 1.012 took much longer than I expected.
They don't have fans in the freezer. Could the bottom of the kegs be getting to cold? They sit right on the bottom of the freezer. No spacer or anything. I believe their temp probe hangs in the middle.
Freezer is a small one. Holds 2 glass carboys.
Their first batch was to young and the second used the same yeast (S-05) so I thought it might have been either to short a fermentation time or yeast quality issues, but they aged the other beers a decent period and used windsor and s-04 for the last two beers.
The aging helped but their is still some aldehyde in those last to beers. The FG's seems within range and did not change after a week. I will note that it did take some time to finally arrive at the FG. Dropping from say 1.030 to 1.012 took much longer than I expected.