KnittyGritty
Lovin' The Homestead
Hmmm, I make kefir regularly, and I always put on a lid. I don't do it tight, but just before it gets snug. I tighten it to shake it up once in awhile, and then loosen it again. Never had a problem. I strain my grains with a strainer and a wooden spoon, scraping the strainer over and over until most of the liquid is strained out - I hold it over a canning funnel that is set on my quart jar.