how clear does the water need to be to be called freshwater?

Question: how clear does the water need to be to be called freshwater?
- Keywords:
  water
Asked by 989envp24 to Karen on 9 Nov 2018.
- Karen answered on 9 Nov 2018:
  
  To be called freshwater is has to be really low in salt! We call the water in the sea “saltwater”, and the non-salty water in rivers and lakes “freshwater” 🙂

Question: how clear does the water need to be to be called freshwater?