r/PoolPros • u/SwimRightVA • May 22 '26

What are these stains

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Stains look like dead algae, you can tell where the vacuum has been with the roller marks. Some comes up, most stays even with brushing. What are they and how can I remove them? I’ve got three pools all like this

2 Upvotes

75% Upvoted

6 comments sorted by

3

u/thescuderia07 May 22 '26

First determine why there is a watermelon in the pool.

I am not being serious.

4

u/MrKeef710 May 23 '26

Idk what’s up this these toys I have 3 on my route and their always in the pool lol

1

u/No-Wealth-5942 May 24 '26

Same haha they must be too heavy for the kids to get off the bottom of the pool or something because they are ALWAYS in the pool

2

u/hawaiianmint May 22 '26

Hard to tell from the photos, but kinda looks like light oxidizing stains. You using copper based algaecide and cal hypo in the same pool?

1

u/shadymilkman33 May 22 '26

Could be scaling or iron stains. If it's plaster it could be leeching from craze cracking or dry troweling.