The first hit on google says 1-4 parts per thousand, or about 1⁄10 as salty as seawater. If 0.5‰ is considered fresh, then that’s probably plenty low to support some plants.
The first hit on google says 1-4 parts per thousand, or about 1⁄10 as salty as seawater. If 0.5‰ is considered fresh, then that’s probably plenty low to support some plants.