Ozone used in water system

Water System
1

Why we are used ozone in PW LOOP system???
If ozone dissolve in water then it required to remove and how that possible???

2

Dear,
application of chemical sanitization (including agents such as
ozone, hydrogen peroxide and/or peracetic acid);

Routine chemical sanitization using ozone or other suitable
chemical agents. When chemical sanitization is used, it is essential
to prove that the agent has been removed prior to using the water.
Ozone can be effectively removed by using ultraviolet radiation

(WHO Guideline reference)

Thanks

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