Okay to wait til end of season to treat black algae spots?


LifeTime Supporter
Mar 23, 2010
San Diego County, CA
I have some spots of what I think is black algae in the deep end of my pool. I'll brush it for now and keep chlorine between 5 ppm and 10 ppm, but I'd like to wait until the end of swim season to get serious about treating it (by increasing shock level to 25 ppm and brushing aggressively for a month). Is that a reasonable plan?
Current #s are
Water temp 81
TC 13
FC 13
TA 80
CH 300
pH 7.5


Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
Sebring, Florida
What is your CYA? Assuming it's less than 60, I'd say that's not a bad plan. If it's higher than 60, you may want to elevate the FC even more, depending on just how high it is.