Algae - Am I in right direction

[acenbees]

Hello all, pool owner for 2 years. had a commercial company help last 2 years. Had green/yellow algae for last 6 weeks. Weekly Pool maintenance person kept saying brush it and should go away. No luck and trying to fix by myself

Read through all basic tutorials and few related posts. Thank you! great resource and helpful community
Bought K-2006 and tested. FC was 1.0 Added 6 gallons (Active Ingredient: Sodium Hypochlorite (10.0%), Other Ingredients: (90.0%)) yesterday evening. Brushed the walls of pool

Morning 7 AM reading
Pool Size : 25,000 gallons
FC: 25
CC:0
PH: 8.0+
TA: 200 ppm
CYA: 100+
CH: 430 ppm

#1 Have i added enough chlorine (as per 'The Chlorine/CYA chart' SLAM for 100 CYA, Target FC is 39
#2 Should I follow and maintain until it passes overnight FC loss test . Concern due to high CYA

 

[Texas Splash]

Welcome to TFP! Your immediate issue right now is the excessively high CYA level. You're going to need to exchange some water to get that down. You might consider doing a diluted CYA test using the link below starting at Step #8 first to see exactly how high teh CYA is.

CYA - Cyanuric Acid Test

Cyanuric acid (CYA) is the chemical name for the product commonly called “pool water stabilizer” … Read more…

www.troublefreepool.com

 

[Texas Splash]

The ideal CYA level also depends on your pool equipment. Be sure to update your signature with all of your pool and equipment info. See my sig as an example. Also remember that whenever the FC is over 10, the pH will read high, so we typically don't bother with the pH test until the FC is under 10.

 

[Mdragger88]

Doing the SLAM Process when cya is over 80 is often impractical & gets expensive.
Definitely do the diluted cya test to see where u really stand as Tex linked so you know how much water to exchange to get to a more sustainable cya level for slam & going forward.
Here’s some info on safe ways to exchange water depending upon your pool type & water table

Draining - Further Reading

www.troublefreepool.com

 

[acenbees]

Thank you! Added pool details to my signature.
Diluted cya test gave value 110.
I have never done a pool drain. Normally, where do we drain the pool water. Draining to road sewer may not be an option as I don't see any outlet

 

[Mdragger88]

Since u have a plaster pool & need to exchange at least 50% of the water to get to around 50ppm cya, you may want to look into the no drain water exchange in the article, it is the least risky to your plaster surface & takes the possibility of floating the pool out of the equation.
If u are on city sewer (not septic) you should have a clean out for your entire house that goes there (usually somewhere in a flower bed in the front of the house) even if u can’t use it for this it would be wise to locate it.
otherwise a street storm water drain may be an option depending upon your municipality’s rules.
If u are in the city of Durham it looks like you can go with the street storm water drain but not the sewer system if I’m reading correctly.

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You may wanna call & ask to be sure.

 

[acenbees]

Thank you all for you help. Appreciate it.
I followed all your advice and the pool is free of algae.
We had our first dip after couple of months this labor day weekend! Thanks to you all!!!