I think I have calcium on the bottom of my liner.

[DJNerat]

Thanks I will try that and let you no what happens. If it does take it off then what I need to do?

[PoolDoc]

We'll discuss it then -- but you'll need test results from a K2006 test kit first. How the problem should be handled depends on various levels in your pool. (K2006 testkits @ Amazon - link in my signature)