de guidance

I have been looking for purified DE for 4 months. The only type that is for sale is food grade, but not purified in the sense that you suggested. Hv... you said that the aluminum in what is not purified is not good. OK... but I cannot find ANY DE that does not have aluminum in it. So... IF I buy food grade DE ( like Perma Guard), is the aluminum content in it enough to cause trouble? How much aluminum is toxic? I would appreciate any guidance that you can give me... I am getting frustrated in my search!! Thanks!!