There response was that they have placed the DE in strong acid solutions (similar to stomach acid), and the bonds of the heavy metals did not break. (westonaprice.org)
Later in life he had multiple other abdominal surgeries along with courses of antibiotics and strong acid blocking medications. (ultrawellnesscenter.com)
And it removes strong acids from the kidneys through the urine as well as from the skin through the sweat. (greensfirst.com)