Algae coming back after shock. Stressed!

[BauerR]

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.

 

[rick6668]

What are you using to test? Do you have a recommended test kit?

 

[BauerR]

The big TF 100 kit.

 

[rick6668]

The big TF 100 kit.

Excellent.

Is your CYA really 18?
What is your CC?

I'd go ahead and SLAM. I'd also consider raising your CYA up to 30-40 to help hold the chlorine. At least after you pass the OCLT.

 

[bridgman]

Sounds like you need to SLAM (Shock Level And Maintain)...

 

[Donldson]

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.

 

[HouTex]

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.

 

[Richard320]

Did you "shock" the pool, or did you SLAM? SLAM = Shock Level And Maintain.

How many days did you have to keep the FC up to shock level to eradicate everything and pass the overnight loss test?