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I just didn't want to use something with a rubber gasket so I pieced together a crock with a similar sized lid. But that was only because I thought I had read that it has to breath. But when I searched for what an actual sourdough crock looks like, they all had metal wire clamping and rubber gasket. The opposite of what I had been led to believe lol. Thanks for your @Focker Focker said:I used Italian Fido and Ball wide mouth one qt mason jars. Both worked fine, Ball much cheaper, and easier to access, clean, without having a hinged and connected lid. I like the taller Ball for growth, even though I kept my starters fed with 100g each of bottled water and KA AP. A sealed jar is ok to use, granted I didn't crank down on them to tighten.
No special sourdough crock is necessary.