Not a fan of DE for long term. It can be very dehydrating and the scratchy consistency of the diatom crystals can irritate the intestinal lining causing a lot of mucus production. When I tried DE there was a lot of mucus that was passing through the colonic tube. That was telling me that the DE was irritating the intestines too much.
Mucus should be clear but can be yellowish when bile combines with it( in the gi tract). Then of course mucus can be green when fighting a infection.