Blue spots in pool plaster

Pics attached.

IMG_4231.jpgIMG_4232.jpgIMG_4233.jpgIMG_4234.jpgIMG_4235.jpg

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Pool store test results below. taylor 2009C test kit on way (replacing cheaper kit from Lowes). Shocked yesterday as I have noticed black mold starting and just now understand why. these blue streaks have been there since we bought the house a year ago.

chlorine 3
PH 7.8
ALK 90
CH 220
CYA 120
TDS 400
Phos 200
 
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