Help! Brown spots overnight in ground pool

Algae problems in swimming pool water.
Green (cloudy) water or slimy pool walls.
Black algae. Mustard algae. Pink or white pool mold.
pitnpup
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My Pool: Pool guy comes Tuesday for maintenance Weds I start to see brown stuff bottom of shallow end Thursday 2 more now 6 pool company says move plants away from pool I am like for real they have been there for a year pool was clean after your guy left 24 hours later this started. Does anyone have any idea I tried C tablets no good

Help! Brown spots overnight in ground pool

Postby pitnpup » Wed 15 Sep, 2021 13:44

Pool guy came Tuesday cleaned and left pool looked great Weds brown spots on bottom of shallow total 3 then Thursday 2 more now 6 C tablets no good pool company owner says move plants from plants I said your kidding right they have been in same place over a year. Tuesday your guy was here Weds spots started

Can anyone help? What the heck is going on?


Teapot1
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My Pool: 12000 gallons vinyl liner,

Re: Help! Brown spots overnight in ground pool

Postby Teapot1 » Thu 16 Sep, 2021 01:17

Water test results?
Need to understand your pool water first.
I may not give you the answer you want to hear, but I will give an honest opinion of your situation as you decribe it.
Denniswiseman
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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: Help! Brown spots overnight in ground pool

Postby Denniswiseman » Thu 16 Sep, 2021 01:21

It's either organic or inorganic
To check for organic (algae) put a chlorine tab on it overnight
To check for inorganic (metal) put ascorbic acid powder (vitamin C) in a sock and rub on it
Ascorbic Acid is readily available on eBay

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