Algae treatment and maintenance

[Kelly001]

At the end of last year, when we would shock our pool (powder shock), black patches would appear on the pool floor almost immediately. They’d fade and look a bit yellow the next day, could be brushed, but never really went away. Of course the pool stores were no help and we closed the pool without having this solved.

Found this site, bought the kit, the CYA was 100, emptied half the pool, refilled, almost have the water in balance (still working on raising calcium hardness), but am ready to take on this algae. Here’s the pictures. It looks really subtle but I can see it better in person. Do I just start the SLAM process? How do I know when I’m done?

 

[ajw22]

Does your pool pass a Overnight Chlorine Loss Test?

 

[ajw22]

How do I know when I’m done?

Algae Archives

www.troublefreepool.com

SLAM - Shock Level and Maintain

We’ve all had to deal with a green pool. Clear algae from your pool with a SLAM! Read here to use shock level and maintain to clear your pool.

www.troublefreepool.com

Once all three of these criteria are met, you have completed the SLAM process and can allow the FC to drop to normal levels.

• CC is 0.5 or lower
• AND your overnight chlorine loss test shows 1.0 ppm of loss or less
• AND pool water is crystal clear with no visible sign of algae (dead or alive) on floor and walls

 

[Kelly001]

I do not know but will look that up and try it. Unfortunately I did not test yesterday. My FC dropped from 8 to 3.5 in the last 48 hours though. Just added 60 oz of liquid chlorine tonight as recommended.

 

[ajw22]

Just added 60 oz of liquid chlorine tonight as recommended.

As recommended by what?

Your CYA is 50, we round up.

SLAM FC level is 20.

Have you tested 30 minutes after adding chlorine that you have a FC of 20?

 

[Kelly001]

I entered my test results in the app and followed the guidance provided by the app to add 59 oz of chlorine. I also just did the nighttime reading as you recommended and FC is 8. I’ll test again in the morning.

 

[ajw22]

I entered my test results in the app and followed the guidance provided by the app to add 59 oz of chlorine. I also just did the nighttime reading as you recommended and FC is 8. I’ll test again in the morning.

You need to raise FC to 20.

 

[Kelly001]

Sorry. I was following your initial advice to do the overnight chlorine test first.

 

[ajw22]

Sorry. I was following your initial advice to do the overnight chlorine test first.

Ok, I didn't know where you were in the process.

Let's see what your FC is in the morning.

 

[Kelly001]

FC dropped to a 6 overnight. My plan is to treat to lower the PH today as recommended in the article, then start the SLAM process this evening.

 

[Kelly001]

Can I add chemicals to impact TA and CH while SLAMming the pool?

 

[ajw22]

Can I add chemicals to impact TA and CH while SLAMming the pool?

TA of 50 and CH of 275 are fine. No adjustments are needed.