I have a white line all around the water line on the tile. In the past I have been adding a bottle of scale inhibitor as per the pool store. My CH is 190. I see that I need to have a level of at least 250. I always assumed that white line was calcium.
What gives and how do I get rid of the white line. I also have large "off whiteish" deposits on the natural stone on the spa overflow. I looks large enough that I could take a chisel and hammer to it.