If sun UV rays can poison purified water?

SODIS = Solar Disinfection.

UV rays purify contaminated water. Here's how SODIS is being used after the tsunami in Sri Lanka.

No it can't poison water. If that was the case nothing could live in or around water. Animals drink it. People drink it. Trees grow around and in water. Fish swim it.

In fact, it's the opposite. UV rays can purify contaminated water. The SODIS method (look it up) is used in many countries around the world where clean water is not available.

Water is put into a clean PET bottle and left in the sun for 6 hours. After that the water is clean and safe to drink.

UV rays disinfect and purify water !