@frustratedearthmother, I just checked the skim milk, with Kefir in it, on the counter. It reminds me a lot of the thinner yogurt, that I used to make (back in the day - before "Greek Yogurt"), that had chunks of yogurt floating in whey, more gelatinous, than creamy.
I'm not sure where the "kefir yogurt" ends & the whey starts near the bottom. But I'm 99% certain that there IS a layer if pure whey down there.
At first, I thought to stir the solids & whey together. But then I decided to put some in a glass. Mmmmm! That is really good! We will just scoop out the kefir/yogurt & pour the whey on the compost. Its too bad we don't have a feeder pig to give it to.
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After I wrote the above comment, DH & I started talking about scooping out the kefir yogurt, to put in the fridge to eat. We have a 2-1/2 gallon glass drink dispenser, with a spigot ( to drain out the whey on the bottom).
So, I did a final wash, and started scooping. This was my first scoop!
I filled the jar about 1/2 full, from the 3 gallons in the canning kettle. I wasn't getting nice clumps any more, so decided to put the rest in my flour sack dish towel (that I use to strain cheese), and am now draining it into a stainless steel bucket, so it will turn into kefir cheese, which we can put in the freezer, for this winter.
I couldn't get it in the picture, but the chain that the bag is hanging from is hooked to an eyebolt in a 2x4, that goes diagonally, over the sink, from the top of one cupboard to another.