Algae in liner

Jun 21, 2015
10
Southington, CT
I’m a long time pool owner and have experienced most everything that can go wrong. I have an 18 x 36 I ground pool. The last 2 seasons I’ve experienced algae on the liner walls and floor. I shock it, vacuum the Crud out of it, but leaves some greenish areas in the floor of the liner that don’t come up. Within days it comes back. The liner is about 17 years old and has lost most of its color. It seems the spores are living in the liner. Is that a thing?
 
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