Algae Maybe

poolstretch

Well-known member
Aug 29, 2020
57
Rockville Centre, NY
I get what looks like algae. It’s on the bottom of my pool. It’s dark green. It’s comes back to the same spots after a day or two after I vacuum. This has been happening since last summer. I did shock the pool several times last summer. after the shocks I saw it back I thought it had to be just buildup of dirt and maybe leaves, but now I’m not sure. my pool is well balanced always and looks clear. Not sure what to do.
 
Your FC is right at the bare minimum for your CYA level. See FC/CYA Levels. I like to run a bit hot on FC and steer well clear of minimums. You want to bump FC up to target level before completing the OCLT. Let us know how it goes.
 
Possibly mustard algae like in your previous thread.

 
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