DE you say? I have heard that before...my husband is a pool man for his second job and he said that they use it in pool filters and he has some...I think he mentioned that if you get it in your lungs it never comes out? Maybe he is mistaken....Where do you buy it? He has some that he uses for the business but I wonder if it is of the same quality that I would want to use internally....hmmm....About how much do you take? Before or after meals?