Why is my CYA high

[shawn1112]

Got my pool cover off yesterday and as expected had an algae issue. Pool is above ground 54" deep and I drained about 2/3rd and refilled.
Was hoping it would lower my CYA level as I believe thats what cause my algae issue towards the end of last season. Started the SLAM process but took water tests prior to SLAM.

CYA 60
PH 7.5
FC 0.5
TA 120

 

[PoolGate]

CYA is fine. Don't add anymore pucks.

Oh and follow this chart for chlorine level.

The Free Chlorine and Cyanuric Acid Relationship

Managing your cyanuric acid and Free Chlorine levels is key to stabilizing your pool. Learn how these two items affect each other.

www.troublefreepool.com

 

[Richard320]

If you've been following the pool store regimen of feeding your pool a steady diet of trichlor pucks with the weekly dichlor "shock". that's why your CYA got so high. It's not beyond the realm of possibility that you were well over 200 CYA at the end of last season. (Secret: Pool store will write "99" on test results when it's off the scale high) When I took over my pool my CYA was in the 220-240 range. Hard to be more exact when it's getting diluted 1:3 and 1:4 for testing.

Astronomical CYA is probably the most common fault we see here when people arrive with a green pool. This weekend the forum will be packed with green pool threads.

 

[shawn1112]

If you've been following the pool store regimen of feeding your pool a steady diet of trichlor pucks with the weekly dichlor "shock". that's why your CYA got so high. It's not beyond the realm of possibility that you were well over 200 CYA at the end of last season. (Secret: Pool store will write "99" on test results when it's off the scale high) When I took over my pool my CYA was in the 220-240 range. Hard to be more exact when it's getting diluted 1:3 and 1:4 for testing.

Astronomical CYA is probably the most common fault we see here when people arrive with a green pool. This weekend the forum will be packed with green pool threads.

Exactly what we have done the last 12-14 years. After educating myself on TFP I have decided to make the switch to liquid chlorine this year.

 

[shawn1112]

CYA is fine. Don't add anymore pucks.

Oh and follow this chart for chlorine level.

The Free Chlorine and Cyanuric Acid Relationship

Managing your cyanuric acid and Free Chlorine levels is key to stabilizing your pool. Learn how these two items affect each other.

www.troublefreepool.com

Thanks bud, I thought 60 was high. I intend on following that chart once I get my algae issue cured.

 

[PoolGate]

Thanks bud, I thought 60 was high. I intend on following that chart once I get my algae issue cured.

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

 

[shawn1112]

2 days of SLAMing. Just about there, will do the overnight test tonight. Still see some algae stains in liner. Probably got to jump in and give it a good brushing from inside the pool.

 

[earbuster62]

2 days of SLAMing. Just about there, will do the overnight test tonight. Still see some algae stains in liner. Probably got to jump in and give it a good brushing from inside the pool.

View attachment 103143View attachment 103144

Nice! What a great feeling

 

[Richard320]

2 days of SLAMing. Just about there, will do the overnight test tonight. Still see some algae stains in liner. Probably got to jump in and give it a good brushing from inside the pool.

View attachment 103143View attachment 103144

Wow, That was fast!

 

[shawn1112]

Did the overnight test last night and FC dropped from 23 to 17.
Checked about 9pm then at 5am this morning
Starting to think my Algae might have been mustard algae and its still present somewhere.
Will bump up the FC today and brush the pool really well again