Chlorine is like vinegar or acid. It comes in different strengths. The PPM depends on how strong the stuff is you start with. TSP vs. Chlorine: TSP is good to use if you have a batch tuff seeds that refuse to let lose of the first leaves. Use warm water for best results. I use a heaping teaspoon in a quart jar, soak for about an hour, rinse with warm water for a few minutes and plant. We use the stuff full strength in hot water to strip furniture and brass, some what like a mild caustic soda (lye). Steve ======================================= * Uncle Steve's HOT Stuff * * Anything & Everything about Chiles * * http://HotChiles.WildSpices.com/ * =======================================