Imagine some kind of Ice9 scenario but instead with a catalytic everlasting ultra-disinfectant released into the water cycle. Could it be stopped? Do we live

Imagine some kind of Ice9 scenario but instead with a catalytic everlasting ultra-disinfectant released into the water cycle. Could it be stopped? Do we live with it? Does everything die and the world enters a new age of archae supremacy? What if it didn’t evaporate so it was oceans only — is the plot about mankind living without fish suppers or is there more to it? The oceans effectively become poisonous to humans too of course. Any city with brackish tidal rivers becomes affected. Does the disinfectant work immediately — do salmon carry it up river? Salmon ladders get blown up by desperate citizens who inadvertently destroy the dams to which the ladders are attached etc. I like hard scifi plots. I am not suggesting this is an actual risk. Time to re-read some classics.