Do I need to get all the Black Algae out? Can I go back to normal chlorine levels now and start swimming again?


Bronze Supporter
Apr 3, 2016
Orlando FL
I've been doing the SLAM for a week now. I have been scrubbing and keeping FC levels up to around 24ppm (CYA at 70) all week.
I have reduced the amount of black Algae spots by 80 to 90% but it's not gone completely. Water is clear.

Can I just go back to normal chlorine levels now (5 to 7 ppm) now and start using the pool again?
Will the "normal" chlorine levels keep the black algae from growing? I can live with a few black spots, but I would hate to give up too soon and have to start the whole SLAM process over.

I have a post on this algae problem here somewhere - but couldn't find it - so I'm posting this question in a new thread.


Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
Sebring, Florida
Do you know how to perform the OCLT? Report your results if you do.......that'll tell us if you should quit SLAMming.