Please tell me it’s not black algae….

katie.e.mccall

Active member
Jul 29, 2023
27
Chattanooga TN
Pool Size
22000
Surface
Vinyl
Chlorine
Liquid Chlorine
Hello! We went on a trip out of town and I left a couple tabs in while we were gone. Came back to find these blackish green spots on the floor of the pool/steps. Figured it was just some algae dust or organic matter that had settled but it does not brush easily away. We have a vinyl liner so I’ve read that it’s unlikely to get black algae? I have scrubbed at these spots though and they really don’t dissipate like I’d expect.

Current deets:
22k gal IG pool
Vinyl liner
Robotic dolphin vacuum

Taylor test kit readings:
Ph 7.8
Tc/fc/cc 0
Ta 50
Cya 30

Obviously beginning a slam now (with LC) -and will continue to brush away. Just wanted to ease my mind a little/start tackling it if it is black algae. Thoughts??
 
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