[How do I?] Steel selection, dealing with mill scale.

[Jim F]

Is that the same used in swimming pools?

We used to use it to clean mortar from newly laid brick, back in the '80's.....

 

[mikey]

Is that the same used in swimming pools?

Yup, works fast and can be re-used.

 

[Illinoyance]

Ann oxy/acetylene flame works well.