Thanks for the detailed reply. I do know a bit about kefir and have used it to ferment things. So I was wondering what product is it that stays out for long, wh

Thanks for the detailed reply. I do know a bit about kefir and have used it to ferment things. So I was wondering what product is it that stays out for long, which I now understand is kefir itself. For some reason I thought maybe it was referring to something else in the GPs comment. As for the process of straining it and feeding it to perpetually make more kefir, I've known about that for quite sometime.