Absorb? Hmmm, I didn't know cannabis was one of the plants that absorbs SiO2, which is the most common compound in the Earth's crust. Most consider it an inert part of the environment, but some can uptake SiO2 crystals. They aren't nutrients, but some plants use it in their cells walls. We aren't really sure why, but it may ward off predators, or help strengthen stalks. Generally speaking, Si02 is a solid and doesn't dissolve in water. Plants have no known way of using it in any of their biological processes. It's truly inert. Humans even put it in their own drinking water, sometimes. But not because it has any nutritional value. DE is truly inert and reacts with almost nothing known to man. Only a few very specific ultra strong acids and bases can mess with it. It can be altered with high levels of heat, but not by the mild heat of our bodies. Watering it into the soil is great for killing bugs in your roots, but I had no idea it was taken up by cannabis. Do you have any good reading on that? I'll do a little 'digging' (hah hah), and see what I come up with.