I'm starting to wonder if it can be easily harvested. I'm seeing quite a bit of info that says the baking yeast does not drop out of suspension much like a Hefe. An intense cold crash may do it, but I can't find anything to back that up.
Not sure if you have seen this article, but it's full of good info and history on Sahti. http://www.brewingtechniques.com/library/styles/6_4style.html
I'm wondering how it gets into the "paste" form. I thought I saw that it was compressed. I'm not exactly sure how that is accomplished. I guess there's only one way to find out. Brewing with it next weekend.
Nope. I ended up brewing 2 beers this weekend, but no sahti. I still haven't "sourced" the juniper branches, and I want to make sure the sahti has them. I'll probably stop by a nursery and see what I can find. I'll let you know.