I really like these ceramic coffee drippers

I really like these ceramic coffee drippers. I already have the larger #4 flat filter size, which has developed a crack over the years, and was trying to replace it, but seems they are only making this smaller size now. My new coffee dripper has an imperfection of a black spot near the drip holes. It looks like the glaze did not fully cover it during the firing of the cup. I imagine it will work fine anyway, but I hope that in time I won't get some kind of clay residue dissolving from contact with boiling water. This should have been weeded out in a quality check.

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