I once had a severe case of cystitis that struck me quite rapidly. I decided to take 5 drops of activated chlorine dioxide and within an hour, all of the symptoms had vanished. Since then, I have continued to take chlorine dioxide-purified water once a day, and I believe that by the time I see the doctor in two weeks, the lab test will show a negative result. This is just one example of how chlorine dioxide water purification drops have worked effectively for me on multiple occasions.