Is your feature request related to a problem? Please describe.
It appears to be impossible to generate this effect without shaders or being underwater, and I think it would be a nice simple addition, and it's probably less consuming for the client.

Describe the solution you'd like
Create a function that would disable or enable this effect.

Describe alternatives you've considered
None, the real alternative is to use shaders.

Additional context
What I am talking about (you can see this effect if you get underwater):

Also I'm not entirely sure if this isn't really added to MTA, but I can't find any documentation on the wiki.