I am trying to set up a carbon dioxide generator using citric acid and baking soda for my aquarium. For citric acid, I want to use something I have abundant of, which is lemon. What I can't figure is what to do with the remaining products after mixing lemon juice and baking soda. I know that mixing the two will generate carbon dioxide. What can I do the salt, acid (by-standers), and water after the carbon dioxide are gone? Can I do anything with that? I don't want to be wasteful.