I guess that they sand the edges of books when they make them. You learn something new every day. We received in six skids of filters from a book binding facility. They were pretty packed. our solids separator looked like paper gunk. this is a picture of a dirty filter and the skid of cleaned filters behind it. When you are ready to do your part in the sustainable movement try cleaning your filters. If we can ever be of help Giv us a shout, or visit our site at www.fpfilters.com
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