Algae coming back after shock. Stressed!

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BauerR

0
Mar 26, 2013
30
Baltimore, MD
Hello all,
Just uncovered my pool this week and it was pretty well green. After some bad advice and a few lessons learned I came to you guys to get me straight.

I thought I won the war on algae but noticed it's creeping back.
I've been testing my water daily and yesterdays numbers were

FC 1-2
TA 80
CYA 18
PH 7.5
CH 130

I should note that my shock FC was 12 and that was using liquid bleach on Wed.
Today I added 2 more gallons of bleach brining my FC number up to 6.
Talk to me, what do I need to do to rid myself of this for good? Higher FC levels over a longer period of time?


What I'm seeing.
 
If your CYA is really 18 (the test doesn't go that low...) then your chlorine is burning off in the sunlight. Raising it to 30-40 will help you lose less during the day. After that a full SLAM will remove the algae and keeping FC within the proper range for your new CYA level will keep it from coming back.
 
Is the picture of an area of poor circulation?

Even though yours is green, I get a small amount of black algae at the water line along one side of my pool (along the tanning ledge) that gets poor circulation. Frequent brushing helps.
 
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