system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If some Oysters can filter 15 gallons of water a day, why are we not putting oysters in highly polluted rivers like the Thames?
gpt
Just because they're filtering water, it doesn't mean they're filtering out what we want them to.

That, and two words:  "Invasive Species"

The zebra mussel is absolutely murdering the Great Lakes.  Humanity has a long history of making things worse by introducing a non-native species hoping it will take care of one problem, only to become a far worse problem.