New pool owner… what went wrong?

Ffg

New member
Jun 24, 2021
2
Canada montreal
Hi! We opened our pool (it’s maybe 40 years old, chlorine, concrete pool). We cleaned it got all the chemicals and balanced it. Everything was going great and then all of a sudden (we hadn’t been using it because we got a few cold days) we notice this black substance (see photos) floating on top of the pool. Can’t seem to vacuum them. Pool bottom is clean. What is that? Thank you
 

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mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
44,915
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
To remove it, best would be a skimmer sock, hair net, or knee high panty hose stretched over your skimmer basket. Then run the pump to skim the surface.
 
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Oly

Gold Supporter
Jun 28, 2017
2,345
Fresno, CA
Pool Size
27000
I'm guessing tiny insects or plant debris. Run your pump and check your skimmer to make sure it is working properly and drawing the debis.
Pump speed is important to move the water and the operation of the weir door is critical to overcome the surface tension of the water.
Hair nets over the basket will catch most of it before it loads your filter.
 
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