Simplify the following text for a Grade 6 native English-speaking person.
Original: A much smaller but important market for chlorine dioxide is for use as a disinfectant . Since 1999 a growing proportion of the chlorine dioxide made globally for water treatment and other small scale applications has been made using the chlorate , hydrogen peroxide and sulfuric acid method which can produce a chlorine free product at high efficiency .
Simplified: There are even more ways to make chlorine dioxide .