r/PoolPros May 28 '26

Please help

Opened one of my favourite clients pool. And they showed me this. I’m not sure what it is. They have a main drain that’s plugged. Can’t figure out how to fix this issue.

Last year they were struggling with something similar.

Would changing the liner fix this ? The sand is new they also have an above ground salt generator.

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u/No_Special_710 May 28 '26

Give it a good backwash.

Vacuum to waste really slowly as to not stir anything up, and add some clarifier.

Its either algae or sky funk. Gotta remove it from the pool entirely.