When your at school or any public places and need to refill your water bottle, you don’t want to fill it up with unclean tap. The new invention called the CrazyCap purifies/cleans water using light. There are two different setting for purifying water. You can use it for tap and fountain water or streams and ponds. It uses UV light do breakdown and destroy any harmful bacteria that might be in the water. Through this process the water becomes safe and drinkable. The process of using UV light makes it so there is no extra bacteria left along with having no harmful things added.

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https://cnet.com/health/best-self-cleaning-water-bottle/#:~:text=Self-cleaning%20water%20bottles%20use%20UV-C%20light%20to%20kill,interior%20surface%20of%20the%20bottle.