virginiarose said:Is Vinegar a chemical too?? 
I believe you are thinking of the term "chemicals" as meaning pesticides. A narrow view, in my opinion, but even so, yes, vinegar can be a pesticide. Applied properly, it will kill vegetation.
Just because something is natural, or seems natural, doesn't mean you can be any more or less careful with it's use. Battery acid (sulfuric acid) is a natural chemical. Does this make it any less harmful? Absolutely not! It will still eat your skin, wood, clothes, car finish, etc.
On the flip side, the pool chemical that is usually labeled "pH Up" is baking soda (sodium bicarbonate) and is relatively benign.
We need to break this paradigm of natural chemicals versus processed or manufactured chemicals.
ALL need to be used responsibly.
