I would like to add the Food Grade DE to my chickens' feed to prevent/treat any worm infestations. Right now they all seem generally healthy, are laying well, and nothing in their poops seems alarming. Still, in SE Florida it's always so warm & wet that I know there are all sorts of parasites lurking unseen. I would like to know the minimum effective amount of DE to add to their food, and how often to include it, in order to treat/prevent worms. The frustrating thing I find in the DE suppliers' information is their recommendation that "you cannot use too much, but using too little will not achieve your desired results". Well, if I were selling DE I'd tell my customers the same thing. But I find it too expensive to waste by using too much, even more so to use too little. Some suppliers recommend for chicken feed 2% by weight, others 5%. How much is that by volume? How much does a cup of DE weigh? I know DE is recommended for many other applications, but I'm primarily interested in using it as a wormer. If you use DE for worming please let me know how much you use and how often you use it in order to get effective results. Thank you!