Passed overnight test still see spots

Jfill6 · 2025-05-23T07:46:10-0400

I have passed my overnight chlorine loss test two nights in a row. Only lost .5 both nights. Water is the clearest I have ever had. I am still getting spots on my floor over night. I vacuumed really well last night and this morning I have spots again. There are no steps in the pool. No toys in the pool. I have scrubbed the skimmer and jet return. These spots brush away. They are in sun and shade. Not sure what to do at this point.

Ph 7.5
TA 80
FC 12
CC 0.5
CYA 30
CH 75

Texas Splash · 2025-05-23T08:34:22-0400

If nothing else works, now that you've passed the OCLT (twice), you might consider taking the FC up to Mustard Algae levels just for one day (24hrs). No swimming during that higher FC elevation of course.

Mustard Algae

Today We are going to show you how you can get rid of mustard algae in your pool. By following the steps in this guide and with no expensive chemicals.

www.troublefreepool.com

sande005 · 2025-05-23T08:50:13-0400

Ditto on @Texas Splash's note. It is a belt and suspenders insurance.
It may just be left overs. It is very easy to resuspend dead algae, especially if just brushing. And your filter may be slow on getting every last bit, so it settles out overnight. Keep on brushing and vacuuming. It may take a few/several days.

Jfill6 · 2025-05-23T09:21:44-0400

Thank you. Going to try the mustard 24hrs fc

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Passed overnight test still see spots

Jfill6

Active member

Texas Splash

Mustard Algae

sande005

Jfill6

Active member