Pool super cloudy with FC = 30, CC = 1.5! Any ideas..PH seems off the chart...

AB

Well-known member
Jan 18, 2011
75
Houston, TX
Hi, pool has gotten super murky/cloudy with the temperatures dropping. All other parameters are good:
TA = 100
CYA = 60
FC = 30 / CC = 1.5
CH = 250

PH I can't tell - on the little plastic reader it shows up "reddish" which makes me think it is higher than 8.2, definitely not on the 'yellow' end of PH..

Any ideas? The PH issue I can't figure out, but just dumped 36 oz of muriatic acid in the pool and still PH shows up red.

Thanks!
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
33,838
Laughlin, NV
If your FC is above 10 ppm, the pH test is invalid and no adjustments to your pH should be made.
I suggest you follow the SLAM Process
You should let the FC drop to below 10 ppm and then test and adjust your pH prior to the SLAM.
 

HermanTX

Gold Supporter
May 20, 2020
952
Katy TX
Pool Size
14600
Surface
Plaster
Chlorine
Liquid Chlorine
With a CC of 1.5 ppm that indicates some algae or bacteria in your water. Which is most likely why it is cloudy. I live in Katy and my water is crystal clear at 65 deg F. and my CC is 0.0 As Marty indicated best to do a SLAM and as part of that to perform an Overnight Chlorine Lost Test Overnight Chlorine Loss Test
Adding the MA did not hurt it as you want a lower pH before you SLAM however don't let your TA drop too low.
 

AB

Well-known member
Jan 18, 2011
75
Houston, TX
Thanks all for replies! Read the SLAM documentation and it looks like I first need to wait until PH is 7.2-7.5. So I should check the FC 1-2 times per day and wait until below 10, then adjust PH?
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
33,838
Laughlin, NV
Check the FC daily. Once at 10 ppm (should go pretty quick with the cloudy water) check pH, adjust, and then start the SLAM.
 

AB

Well-known member
Jan 18, 2011
75
Houston, TX
Ok checked today...FC at 35 (yikes!) CC at 1.0. Took the chlorinator out as one had suggested. PH still "red" - unable to tell how much higher than 8.2 it is.
Should I add more muriatic to bring down the PH say 0.3-04?? Or just brush the pool and wait a day?
 

JJ_Tex

Bronze Supporter
Jul 17, 2019
1,857
Prosper, TX (DFW)
I would wait until your FC comes down so you can get an accurate test, vs just blindly adding acid.

What type of chlorine was in the chlorinator? Assuming it was trichlor tabs, those are acidic and have been adding acid all along and your pH is likely not as high as you think.
 

AB

Well-known member
Jan 18, 2011
75
Houston, TX
ok: FC = 9.5, cc = 0.5!

ph is red-orange, seems off the top of my ph scale that tops out at 8.2 with a pinkish color. Estimate at 8.5 maybe?
do you suggest adding acid ?
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
33,838
Laughlin, NV
Target a pH of 7.6 from a level of 8 using Pool math. You need your TA level to get a proper result.

Let that circulate for 30 minutes or so and retest. Repeat until your pH reads under 7.8. Then adjust to 7.2 and SLAM.
 

AB

Well-known member
Jan 18, 2011
75
Houston, TX
ok, after the muriatic PH was down to 7.5. So I started the SLAM process. With CYA at 80 it says I need 24 FC. I have raised FC up to 21 so far, but ph is now back up to "red" region - e.g. greater than 8.2.
Should I use muriatic while SLAMming? Or disregard PH entirely until FC is at 24?
Pool is still the pea green soup color it has been ever since I started the process...kinda disappointed.
 

HermanTX

Gold Supporter
May 20, 2020
952
Katy TX
Pool Size
14600
Surface
Plaster
Chlorine
Liquid Chlorine
With CYA at 80 it says I need 24 FC. I have raised FC up to 21 so far, but ph is now back up to "red" region - e.g. greater than 8.2.
If CYA is 60, the SLAM FC is 24. If CYA is 80 then SLAM FC is 31. Also, you have to maintain the FC at this level. Don't let it drift drastically low or it just adds time to your process. If you can test every 3-5 hrs during the day to keep the FC up to recommended levels would help the process.
 
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AB

Well-known member
Jan 18, 2011
75
Houston, TX
ok got it up to FC=31 today! Will monitor in 4 hrs! Still green as can be but time to trust in the process!!! Thanks to all for continually supporting my questions and learning!!!
Good thing is cc went down from .5 to .25...
 

AB

Well-known member
Jan 18, 2011
75
Houston, TX
after 2 bottles of chlorine FC is at 56. Didnt mean to go so high but hopefully this will kill the cc=.25 that is making the pool green. How many days should I keep it at 31?
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
21,141
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
after 2 bottles of chlorine FC is at 56. Didnt mean to go so high but hopefully this will kill the cc=.25 that is making the pool green. How many days should I keep it at 31?
Follow the SLAM Process step by step with no short cuts. Test your FC a few times a day and maintain Fc of 31 until the pool meets the three exit criteria.

You are done when:
When all three are true, you are done SLAMing and can allow the FC to drift down to normal levels.
 
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