I have to report a failure:
I've never tried it before but liked the idea of capturing and breeding free brewing yeast, so I've been experimenting according to
this âHow Toâ.
Everything was cleaned and disinfected, I boiled up 200g of medium spraymalt in 2 litres because that's what JP said, added the bottoms of a bottle of SNPA and left it to see what happened.
Not a lot happened, and continued to not happen for coming upto a fortnight. There seemed to be positive pressure inside the DJ and I did see the occasional pop through the airlock, but with 2 litres of fluid inside a gallon DJ I didn't think anything untoward of it. I didn't think that 2 litres of fluid inside a gallon DJ seemed like a particularly good idea and had already resolved to do things differently next time.
Although not a lot appeared to be happening, there did seem to be a growing amount of sediment, and there were some clumpy bits floating around the edges. S-04 makes clumpy bits but I've never used US-05 and don't know how that behaves, so again I didn't think anything untoward.
Then I read this topic of Snail's and got suspicious, so I racked off my âspentâ wort to grow on the sediment. I dunked a hydrometer in a sample, it didn't sink. I spun it to dislodge any bubbles but it obstinately refused to sink any further.
I stuck my nose in the neck of the DJ and sniffed - a vague whiff of something petro-chemical. I had a taster from the trial jar and slooshed it around my mouth for a while - malty sweetness, with maybe just a hint of vinegar.
I spat it out and poured everything else down the sink.