Usually, I'd say just go with more chlorine, but I dunno. If the liner feels slippery, you are probably fighting algae. But if it's not and "squeaks" against your fingers, that's not it.. I'd have the pool store test for copper and iron, if you don't have your own metals testing kit.
Update: You say it feels slimy. Shock the heck out of the pool and brush it every day. I think you still have algae.
Carl
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