K-97 Yeast

Pros

• Nice work, I use K97 often at home and really like it, never had an issue.
• Made a Kölsch earlier this year, also with K-97. Easily became my favorite brew thus far in 2025. ... Amazing results. However, I thought it'd never clear up, but were surprised to see a very clear beer after a few weeks in the fridge.
• Just recently took my first stab at a Kolsch and used K-97. After reading up about all the issues people have, I ended up with a brite beer without finings; after about 4 weeks of lagering.
• That said, K-97, while flocculant, is quite resistant to settling, so don’t be surprised if the last beer in the batch still seems a little yeasty even if it’s been in the fridge for a few months.

Cons

• How was the K-97? I’ve heard it can be pretty sulphury and hazy. I have some; just haven’t used it yet because I hear it’s notoriously hard to use
• K-97 is known as a yeast that just hangs around, giving a yeast flavor.
• The only time I used K-97 there was still suspended yeast after 6 months in the fridge!
• K-97 is difficult to use but turns out a very good kolsch when it goes well. ... K-97's inability to drop clear does kind of suck but if you manage your boil pH correctly and also use a cold side finning agent it will drop crystal clear.
• K-97 honestly seems to be more appropriate for low-ester wheat beers than kolsches.