Circular lesions on pool surface

Stains on the pool surfaces, pool equipment
or on the swimmers, or off-color swimming pool
water. Discolored but clear pool water.
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Posts: 1
Joined: Sun 29 Aug, 2021 09:45
My Pool: 21,000 Gallons
DE filter
Built in the 1970s
Not heated

Circular lesions on pool surface

Postby Dantheman21 » Sun 29 Aug, 2021 09:51

Hello all!

New pool owner here - trying to figure it out.

I noticed over the last 2 to 3 weeks that the bottom and sides of the pool have developed these circular clear/white “lesions.” Upon closer inspection, it almost looks like the concrete surface is eroding? I took a pool sample to the local store: pH normal, free chlorine a bit high at 5 ppm, calcium low (180), total alk low (55), phos high (3000), the rest normal.

Local pool store guy did not know what the problem was, recommended correcting the calcium and observing.

I have pictures, but can’t figure out how to attach them to this post

Any thoughts?

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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: Circular lesions on pool surface

Postby Denniswiseman » Mon 30 Aug, 2021 01:44

Where you write a post
Click Full Editor & Preview
Click Attachments
Click Add Files or you can drag and drop

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