Baking Powder substitute

I like cooking baked goods, which takes a lot of baking powder.  Do you know what's in baking powder?  Two separate sodium salts, for a total of 95 mg per 1/8 teaspoon, i.e. 760 mg per teaspoon.

Then I discovered there are substitutes for baking powder, and baking soda as well, that use calcium salts in place of sodium.  Get them at Ener-G Foods.

So far I have had very good luck when I use half regular and half substitute.  (Just keep in mind you have to double the amount when using the substitute.  For example, if the original recipe called for 1 tsp baking powder, I might use 1/2 tsp regular baking powder and 1/2 tsp x 2 = 1 tsp baking powder substitute.)  I am now getting brave and trying recipes with only substitute ... we'll see how it goes.