Thanks for the advice. I am not sure what kind of liner but I know its not the thickest. I was thinking about buying a clarifier. Will that work? I only have powder shock and chlorine tablets. If I use the tablets and not the shock since you said might make it worse, woukd that help it? My test for cya goes to 300 so it should really be at 100. If so, would the water changes still work?