Thick white stuff coming out of gunite shell

So it has been snowing a lot and it just melted today and the shell of our gunite has white stuff coming out of walls of the shell everywhere but mostly at top and stairs.

I tried looking it up and is it calcium carbonate leaching in gunite shell? Efflorescence? Are they the same thing? Will it be ok? They are supposed to do the waterline tile and coping soon.
Thanks for any advice.
Liz