For the Alk, you bake Baking Soda in the oven for around 1 hour at 300-350. Heat up water, dissolve this baked baking soda. Do the same thing, add the powder, then add the water, so you have a total volume of 1 gal. If some of the h20 boils off, you can always add more up to 1 gallon, so you know you have the same strength solution each time (assuming you used the same amount of powder, and it is uniform in composition)