Can't destroy field

[Wilbur_Coop]

Hey all field is in wrong play tried destroy action nothing happened then tried salt still there just really brown

[Forungi]

I think you need to use Coarse Salt on a field 2 times for it to vanish.

[jcwilk]

I think the coarse salt starts decreasing purity first in certain increments, then once the purity gets to 0% it takes another ~2 coarse salts to destroy it.

I think this is so that high purity fields are slightly more inconvenient to grief. Similar mechanic with turkey coops except with smelling salts instead.