[modo_mario]

>farmers will sometimes place rusting iron equipment in the water ways to reduce metals accumulating in the topsoil.

Hoes does this work and related to the arsenic and acid rain?

[Joel_Mckay]

Would have preferred a better source, but likely a similar process to the following:

https://wedc-knowledge.lboro.ac.uk/resources/conference/26/w...

Best of luck =3