Success breeds success. Go w/single infusion for the first batch. Once you're comfortable and successful at that work to improve. I use single infusions almost exclusively.
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I think you'd have the best luck by pitching an actively fermenting starter. Generally, I like to have my starters finish and decant them, but this is a special circumstance.
What's your water's mineral levels like.
A rough guess would be the bleach changed you pH enough to precipitate out a bunch of material.
I started noticing a weird film in my coffee cups when the coffee was poured from my thermos. Its been several years since I really gave it a good cleaning. I decided to clean w/ OxyClean. Oh my, what a disgusting mess. After an overnight soaking, the Oxy water looked like cola and the black flakes just kept comin- rinse after rinse. The "flakes" looked like black, soggy corn flakes. I had to OxyClean a second time as the flakes just kept comin. After the second soak (24 hrs this time), it just took a few rinsings and the inside is spotless.Maybe a sanitizer chaser. I usually bleach (Clorox Clean Up) my percolator when the color gets too dark.
I know many of you will come on a tell how spotless you keep your thermos, but I'm betting some of you will find the same disgusting mess that I did. Soooooo- hit your thermos w/ OxyClean and tell us how it went.