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When you use two filters instead of one, first a courser filter (metal) and then a finer filter (paper), you believe you are extending the life of the finer filter, but in reality you are doing the opposite. By only letting the finer particles reach the paper, what you are doing is actually clogging the paper faster, because all those very fine particulates ...
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This is a common problem I experience with my Chemex as well. My advice is as follows:
Pre-wet your Chemex (brand) filter while it's in the Chemex. While doing this make sure it's flat against the Chemex walls, this helps to create a "seal" that prevents the filter from falling. Be careful not to push it into the spout during this process.
I ...
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As you've mentioned coffee and tea paper filters tend to vary in size and in pore size. You can use them for both, but I would expect different results. When I used to camp I would use individual paper tea bags that are intended to be filled with loose tea and filled them with coffee grinds. The result was better than using packages of instant coffee but it ...
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