I use them in a fake Chemex I have at my parents house. They work well and I don't need a metal filter even though I use 2 filters at the same time. I think using 1 would be fine and it never broke me, but I think 2 helps make it a bit stronger and I think if dirt was a problem using 2 might fix it. In my experience, the pieces of coffee did not come through. If you are looking for a cheaper alternative to Chemex branded filters these are the ones for me. I'm sure they will work well in the cars they are designed for.
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