So I thought I'd write a little update on the brew after 18 days of fermentation. So as I told you, I had no option than to ferment the beer with the FV in a big waterbath with iced bottles. Of course, as timing would have it, the first week or so, the weather was great - to great for beer with warm temperatures and lots of sunshine. I wrapped a camping/gym mat with tin foil and wrapped it around the water bath and around the lid, which was only losely laying on the whole thing to keep dirt and rain water off. I also shielded it with a parasol. I found that I really struggled to keep the temps down at 13 degrees max, although the whole isolation helped to keep it one or two degrees down. If I had to guess, then I would say that the fermentation temp was 15 degrees on average maybe 16 at times. The ice bottles melted quite quickly too and I changed them every morning and evening.
The OG was 1.059 and today I took the first reading, not having touched the beer at all in 18 days. It reads now 1.010 which is much more than I could hope for. The recipe suggested an OG of 1.051 and FG of 1.013 so I guess I really am done fermenting. Should I now do 48hours of diacetyl rest? does it have to be 22 degrees for that or would 18/20 be okay?
I also had my first taste test today, wondering if there would be any fruity notes. The beer is strong (it has a lot of alc and I will ad a litre or two of water to dilute it), it does taste very nice (I was going for a Bitburger clone, sort of) and there are no fruity notes. You can barely taste the yeast but there is still a slight hint of it, which should go away now in the coming weeks. If there was anything then I would say it seems slightly "sour" but I don't think that would be anything to do with the yeast, would it? It will also be better once diluted a bit.
So... what are your thoughts? Oh and how long do I have to bottle condition a pilsener?