White scale on waterline?

[Ngosch]

Is this scale? How do I get rid of it? It’s only like this in a few different places around the water line.

 

[Bperry]

Is this scale? How do I get rid of it? It’s only like this in a few different places around the water line.
View attachment 525902View attachment 525903

Pick some of it off and add a drop of acid on it to see if it fizzles. If it does, it’s calcium.