I have never heard of kefir and have no idea how to use it???
I found your site looking for straining lids for my own sourdough starter recipe that I have used off and own for 40 years, not long for the history of sourdough!
It took me FOREVER to figure out your screens are not FASHION COLORED! At least I'm hoping not as there were no color choices
My daughter was in a near fatal crash and she has to work diligently to keep her guts healthy, so I am looking forward to researching your sight.
MabelLucy