For anyone that has seen the coastline of the Philippines, it’s surrounded by slums. Not just the slums contribute to the mess, I don’t believe Philippines have a good waste management. Everyone’s rubbish eventually ends up in the sea, and it’s disgusting. Even in some “resorts”, the beaches are disgusting. I would only trust waters away from Manila and other bigger cities.

I've been to Vietnam and Thailand and can confirm, the waterways there are choked with plastic waste, and every other kind of waste. Every fish meal you eat is sus. At some markets, they run metal detectors over, prawns, for example. They're testing for lead content. No joke