Interesting thoughts on the MgOH2. Since I never heard of it until IL mentioned it in the de-funk de pits thread, I have no thoughts about it. But, if you try it and it works better than the baking soda, let me know. I would imagine, though, that you couldn't do an oz for oz substitution with them since they are chemically different substances that will work differently. It took me a while to figure out the right combination when I reduced the baking soda and added the DE. I had to change the amounts of everything. But, for those that didn't know where to start experimenting, this is a good beginning point.