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We have a bunch of small brown dots on the vinyl liner on the stairs. They only seem to be on the stairs and not anywhere else? What are they and should I be concerned?

We moved last July and had a new 20x42 vinyl liner saltwater pool installed in the late fall. We opened the pool a week ago and I just received my Taylor K-2006 test kit. Below are the our current readings FC - 3.0 CC - 0.5 pH - 7.4 TA - 130 CH - 40 CYA - 75 CSI - -1.20 Water Temp - 64 2 days...