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Like many of you, I'm always on the lookout for inexpensive alternatives to
the materials and tools we use. One of the few things that I haven't been
able to locate is a good source for the type of open-celled foam used for
coarse mechanical filtration in Eheim "classic" and other cannister filters
-- the stout, blue stuff. Something suitable for fine mech filtration
would be peachy, too. Has anyone located a good source for such material?