I could find no other place to ask this so I thought this would be the closest to correct. I am a newbie so hello all!! I have had **** with my pool for the past 2 years and am getting under control as we speak. I see the light at the end of the tunnel thanks to Denali and chem geek on another forum....now for the doozie...I have a grit like scale all over my pool liner..I have used store purchased pool chemicals for many years and never have had this until last year and now....I have started the BBB method which is going to make it where I can swim this year..this is a first. So back to the stuff on the liner....how do I know what it is and how do I remove it?? Or do I need to buy a new liner?