The Phuket Fisheries Office says black water on Patong Beach is caused by plankton bloom which is a normal annual phenomenon in the Summer.
Our previous story:
Now for the update:
The Phuket Fisheries Office Chief Mr. Sitthiphon Mueangsong told the Phuket Express that the black water is is a normal phenomenon that has happened every year in Summer. It is called plankton bloom. The sea water turns dark brown, red, green, or black after the amount of seaweed has increased. However, this will not last very long and not affect tourism.