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I haven't read or watched his stuff..send me a link! I'd like to take a look.
You should be able to use that as a starter but really, you don't need to have a starter at all if you just let it ferment naturally. The purpose of a starter is to
get things going more quickly and also
to propagate specific LAB.
If you do natural fermentation, aka "wild fermentation", the ferment will begin by what is already in the air and on the substance you're fermenting. It is definitely a little more of a wild card but people fermenting sauerkraut, cheese, etc., for YEARS just did it the natural way.
In fact, that's why there are so many different kinds of cheeses - many of them named for the town in which they were first made. This is because the milk and the naturally present bacteria in that area of the world was different than what you'd find in a different part of the country or world (Think of Cheddar, Caerphilly, etc. ..both named after the towns in which they were made.) Both very similar cheeses but the naturally present bacteria, the ground the cows fed on, etc. were very different and produced a different cheese with a slightly different flavor.)
There are many kinds of LAB. Some are
mesophillic ("medium temperature loving" - 72 - 95 degrees F approximately) and some are
thermophillic (higher temperature loving - 100 - 116 degrees apx.). An example of a thermophillic culture are the cultures used in yogurt which grow well at higher temperatures of about 110 - 114 or so.
Cultured buttermilk is made with mesophillic cultures which propagate better at the lower temperatures. Both of the cultures begin to die if the temperature is raised above the range that is healthy for them.
So...
most of us that are doing feed are doing it at temperatures that would favor mesophillic cultures. If you want to use a starter you could even go get a
little cultured buttermilk that has LIVE CULTURES and put a little bit into your bucket. That would be a very inexpensive item to use as a starter that is widely available!
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Now...
ACV is actually a a product of a whole different kind of ferment. It
comes after the alcohol stage and is at the point in which
all of the carbs have been digested and what you have left is a high ACID product (low pH).
As I understand it (and I may learn more and have to change my view in the future)
the main benefit of putting the ACV into your ferment would more than likely be to acidify the mixture a little at the beginning to help keep the "bad bacteria" from proliferating and give the "good" bacteria the chance to begin to grow and get a good foothold. The high acidity of the ACV does not allow bacteria to be present
within the acv - or at least in very low levels.
Some of the folks using ff have noticed that when it gets smelling "funky", if they add more ACV that seems to rectify the problem.
What I believe (based on my knowledge) is happening in that process is that the "not so desirable" bacteria and yeasts/molds are growing out of control and by lowering the pH (raising acidity) you are actually creating an environment in which they begin do die off and hopefully are giving the "GOOD BACTERIA" the chance to begin to proliferate again.
So... sorry I seem to have "written a book" again...I hope some of that is helpful and makes sense.
I'm just getting ready to leave an will not be back on probably until later tonight so I won't get to read for awhile!