Mustard Algae?

Shawkr

Member
Sep 9, 2021
22
California
FYI, I tried the muriatic acid to no avail. At this point it seems we either resurface entire pool or leave it as is. After taking a look underwater with new goggles, it doesn’t appear to be a stain but actually the surfacing material (paint,plaster,whatever) failing.
 
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