UPDATE: I used the Jack’s product per their recommendation. It did work well and took out all the major stains. It didn’t clear the very faint light grayish stain over most of the floor. But that is fine as it isn’t really noticeable by most anyone else. My calcium before was about 240 and during was about 450 and after is back to about 240. So I am aware that it took the calcium and staining off the walls and floor and then put only the calcium back on, which I am OK with because it is clean calcium.