ClearRay is a brand of UV-C water purification system which uses ultraviolet light to purify the water by killing bacteria, viruses and other microorganisms that affect water quality.  An ozonator, on the other hand, uses ozone to purify the water.  Ozone is a form of oxygen that is highly reactive and can be used to kill microorganisms to help sanitize the water. ClearRay and ozonates are different types of water purification systems.  They can both be used to help sanitise water, but they work in different ways.
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