Patent ID: 9370802
Filing Date: 2016-06-21
CPC Classification: A61L,B08B,C02F

Claim Text:
1. A method of cleaning and sterilizing an ultrapure water manufacturing apparatus, a point of use (POU) of ultrapure water, and an ultrapure water channel connecting the ultrapure water manufacturing apparatus and the point of use, the method comprising: an alkali cleaning step for supplying alkaline solution to at least part of an inside of the ultrapure water manufacturing apparatus, POU and ultrapure water channel and circulating the alkaline solution therein, thereby cleaning the at least part of the inside of the ultrapure water manufacturing apparatus, POU, and ultrapure water channel, followed by draining the alkaline solution from the at least part of the inside of the ultrapure water manufacturing apparatus, POU, and ultrapure water channel; a first flushing step for supplying water to the ultrapure water manufacturing apparatus, POU, and ultrapure water channel, thereby flushing the alkaline solution remained in the ultrapure water manufacturing apparatus, POU, and ultrapure water channel after the alkali cleaning step; a preparation step for preparing a sterilizing water by heating the water supplied in the first flushing step to a predetermined temperature or supplying hydrogen peroxide to the water supplied in the first flushing step; and a sterilizing step for circulating the sterilizing water in the ultrapure water manufacturing apparatus, POU, and ultrapure water channel, thereby sterilizing the ultrapure water manufacturing apparatus, POU and ultrapure water channel, wherein the cleaning and sterilizing steps are repeatedly performed twice or more.