* WLP036 Dusseldorf Alt Yeast
PLATINUM STRAIN – MAY/JUNE
Traditional Alt yeast from Dusseldorf, Germany. Produces clean, slightly sweet alt beers. Does not accentuate hop flavor as WLP029 does. 
Attenuation: 65-72%
Flocculation: Medium
Optimum Fermentation Temperature: 65-69°F
Alcohol Tolerance: Medium

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It lists 65-69 as appropriate fermentation temp. I fermented lower due to literature on typical Alt production. I was at 62F. What I found is a very fast start to fermentation. Very vigorous fermentation that was totally complete in 4 days. This was totally not what I expected. This was faster than the fermentation I get with 001 or 002 (same starting gravity). Is it possible that this yeast should be fermented even lower than what your range is, or is what I experienced OK and not unexpected?

That fermentation time is still acceptable. You could lower the temp, but that is up to you. I caution two things when fermenting lower than our recommended range: 1.) sometimes the yeast will become stressed and produce sulphur and 2.) if the yeast drops out, most of the time it is a pain to restart fermentation. Just keep both points in mind.