Results are backwards and don't make sense. A index of -.5 or lesser are corrosive and will pit, but app says this is scaly. A index of .5 or greater should be scale forming, but app says this is corrosive and will pit. Sometimes app says silly things like "scale forming, but not corrosive," can something be scale forming and corrosive? Are these two things not opposites? The rest off the app looks good, can you fix this? I will rate this app again when fixed.