"It tastes the same as the Japanese Sea..."
Bro; if that's the case, that poison river was only the beginning of danger!
The oceans around Japan are some of the most polluted waters in the world; the Indian Ocean is possibly worse, but the ocean where China throws their trash is one of the worst bits of water on this planet.
If it tastes like the waters off Japan...? Well, uh...
You're in deep shit, my dude.