The waste water that leaks out is water that already now goes into that coastal environment, and the algae that leak out are biodegradable, and because they're living in waste water, they're fresh water algae, which means they can't live in salt water, so they die.
El agua residual que se filtrara es agua que ahora mismo, llega a ese ambiente costero; y las algas que salen son biodegradables, y, como viven en aguas residuales, son de agua dulce, lo que significa que no pueden vivir en agua salada, y mueren.