Hard White/Yellow Milky Stuff

[Jabooh1]

Hey guys... Found this today under my waterfall.


It wouldn't come off with a brush, haven't hit it with acid yet. It is smooth, shiny, and only in one spot.

Thoughts?

 

[duraleigh]

Remove it with acid....start with 3:1 water/muriatic and then go 2:1 or more until it comes off. Rinse right away with clean water.

It will come back sooner or later....nothing you can do.

 

[Jabooh1]

Thanks! Any idea what it is? It's above the waterline and almost never gets wet.

 

[duraleigh]

It's called efflorescence. moisture from behind the rock migrates onto the surface where it evaporates leaving behind the minerals it has carried with it.