UV Sterilizer or Ozone Generator
UV Sterilizer is cheaper but ozone generator is better. But understand the Ozone generator for water purification has its own purpose and must be properly balanced.
You also need to think about how much ozone you want in the water. Do you want to just ensure that the bacteria and viruses have been killed in the water? Or do you want to ensure all of the volatile organic and possibly toxic compounds have been destroyed in the water? Perhaps you want both of those things to happen but you also want there to be ozone remaining in the water? All three of these examples require different levels of ozone, ranging from relatively low levels of ozone coming from the ozone generator to very high levels of ozone.
UV Sterilizer on the other hand, is only able to eliminate microorganisms in water. UV technology does not remove any other contaminants from water such as heavy metals, salts, chlorine or man-made substances like petroleum products or pharmaceuticals. Other filtration methods should be employed with UV to ensure that all contaminants are removed from the water.
So Reverse Osmosis should be a far better option in terms of complete water purification.
Thanks @ Darlington for this clarification. Am actually going for a complete water purification system which includes the Reverse Osmosis which I believe can remove heavy metals, salts and chlorides etc. like u mentioned above. This is in addition to the UV Sterilizer which can eliminate microorganisms and viruses in the already treated water. I will equally appreciate further clarification if any in this regard. Pls I will need ur contact so we can discuss further on this. Here is my contact. Thanks once again.