I have a comment here on DE. I have studied it for several years now, and have read any and every test I could find the results on, both FOR and AGAINST  DE.  What I have concluded, from the personal experiences of my self and others, clinical test, anufacturers claims, and government claims, is this:

DE has a machanical affect on the parasites. DE dries the waxy under bellies of the parasites and insects. As to why it dries them, seem to be under debate.. Some say it scratche their belly, while others claim it is a DRYING AGENT, and therefore used in other products, to dry, and also in food stuff, as an anti caking device.

DE ONLY helps control parasites, in the stomach and intestines, as it HAS TO COME IN CONTACT with the parasite.  Therefore,  DE is INEFFECTIVE on blood worms (which have been known to caused blood clots) lung worms, heartworms,
flukes (liver worms)  and other worms, NOT in the digestive system.

DE is VERY high in trace minerals.. Studies have proven, that animals with high mineral content in their feed, DO NOT CARRY AS HEAVY A LOAD OF PARASITES, AS ANIMALS DEFICIENT IN MINERALS.. Better health in animals, gives them a stronger resistance to parasites.. Also, the high mineral content accounts for some of the "healthy coats" so many claim to have in their herd, while using DE.

DE also has silica in it, which is KNOWN to make the coat shiney.

As for DE in the manure in the pasture, remember, DE is a DRYING agent FIRST AND FOREMOST, so it would make sence, that it would work better in the DRY fields, than it would in the MOIST interior of an animal.

On the documented studies I have read, DE also takes a LONG time to be affective.. 1-2 years before a noticable change is evident.  This would explain the theory, that the DE is ACTUALLY coming out in the manure, and depleting the parasite population, by killing in the fields, so less parasite larva and eggs are INGESTED.... If you pull all your information together, the results really dont conterdict each other. It is just that those doing the studies, are interested in proving one theory or another... Seldom is someone totally unbiased, seeking the trueth... Usually, these people either have a point to prove, or are funded by a large company, who have some GAIN from the RIGHT answers..

I believe that DE DOES have some good affects on the overall health for animals.. I also feel it has some draw backs. The biggest problem I see, is the TIME it takes to have affect, and the LIMITED amount of parasites it affects.

If DE will work into your regimen, then I feel it is safe to use. BUT it is NOT the panaseaya that folks are suggesting... DE is only PART of the puzzle.  It is only ONE of the ingredients that should be included in a GOOD parasite program...

My hope is that this article will stop the hurt feelings, and shed some light, on a VERY controversial product.