Hazy Water?

[EdPepp]

Water has been a little hazy for a few days now, not sure how to clear it up. Numbers seem ok although CYA is a bit low and pH is a bit high.
FC 4.5
CC 0.5
CYA 40-50
pH 8.0
TA 80
Salt 3200
temp 88
I disassembled the filter and cleaned the cartridges 1 week ago(preventative maintenance)and the water looked great for a few days.
Any thoughts, or is it SLAM time?

 

[mknauss]

Do a Overnight Chlorine Loss Test

Sometimes higher pH can make your pool water look dull. So lowering the pH to 7.6 or so would be a good idea too.

Running a SWCG with low CYA can lend itself to FC dips in the heat of the day.

 

[EdPepp]

Added 16oz acid and dropped pH to 7.6, will do OCLT in the morning.

 

[EdPepp]

OCLT
9pm 4.5-5
5am 4.0

still hazy, I’m thinking it’s time to SLAM? Noticed a bit of green on the steps this morning.

2nd question, should I bring CYA up to 60 before starting?

I also added another8oz of acid to bring pH down to 7.4

 

[duraleigh]

Sounds like a SLAM to me, too, even though your OCLT passes. (that happens sometimes)

If you can see visible algae, it's a good plan to SLAM.

Leave your pH alone......7.4 is just fine to begin the SLAM

Leave your CYA alone, too. Referring to the FC/CYA chart in Pool School, you will use less FC as your FC SLAM value will be lower.

 

[EdPepp]

Good afternoon all,
So I completed SLAM, OCLT was .5 and water has cleared up.
Is it safe to add liquid stabilizer now to increase CYA?

 

[mknauss]

Is it safe to add liquid stabilizer now to increase CYA?

Yes. Add about 2/3 of what you need to your goal, and test CYA 24 hours later. Then add the balance.

 

[EdPepp]

Thank you!