Baking soda is OK...the only problem is balancing the carbonates with CaCl, making sure you have the right amount of each. There is info online about how to make your own 2 part supplements, and in fact there is a company that sells "make your own" 2 part kits, with Na bicarbonate, carbonate, and CaCl, and instructions on how much to use of each...sorry, I forget the name. However, its worth it for me to buy B-ionic gallons 3 times a year, for the simplicity alone. and for you, 2 gal (1 of each) would probably last well over a year. Meanwhile, you can add the CaCl shortly after adding the baking soda...once it has fully dissolved into the tank. A few minutes should be fine. Take care, Eric