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Black waterline


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Calling all you pool experts this time.  We have just opened up our pool and there are unsightly black marks all the way around the water line.  This has never happened before and we are at a loss to know what to do.  We have tried Aqualine Gel, even leaving it on for extra time, but whilst it lessens the marks it does not remove them.  We visited a pool company yesterday and they didn't know what to do either.  Is there anyone out there who has had this problem and knows what to do.  Grateful for any help you can give us.
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