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Quote: Maybe you're thinking of the cartridge type filters, which are polyester fiber. Or one of the numerous DE alternatives. Or perhaps it's the fact that many of the filter tanks are/were made of fiberglass.

Quote: An unbiased study would have fed both groups the same amount You seem to be confusing the quantity fed with the quantity actually consumed. It's not that one group of birds was fed more or less, it's that the group ate more of what it was fed. It's common for such a factor to be...