Small black dots on pool surface

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Ken1
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Joined: Wed 01 Sep, 2021 09:50
My Pool: Inground gunite

Small black dots on pool surface

Postby Ken1 » Wed 01 Sep, 2021 09:56

Had my inground pool resurfaced 3 years ago. 2 years ago ,I used a metal brush on a drill grinding paint off pool deck .I never considered the metal from the brush ending up in the pool. I have several black dot stains in surface . Anyone had a similar thing happen? And what gets rid of the black dots? Thanks


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Denniswiseman
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Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: Small black dots on pool surface

Postby Denniswiseman » Wed 01 Sep, 2021 12:11

Ascorbic Acid (Vitamin C) or Muriatic Acid (Hydrochloric Acid)
It doesn't remove it completely but holds in suspension
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