water became cloudy as soon as I added cal hypo

primuspaul

Well-known member
Sep 3, 2018
92
NYC area
So initially this was a new fill, so I started maintaining it with trichlor tabs. Everything was fine at first. Water all clear. Then, when I saw CYA reached the needed levels of 40-45, I switched to cal hypo to avoid going into CYA runaway. Pretty much the next day after application, the water turned cloudy, and has only gotten worse. I always maintain FC between 3.5->9.0, testing twice a week. What do I do to fix it?
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
36,315
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Please post a full set of test results.
TA and pH levels can make cal hypo cloud your water.

Are you adding chlorine every day?
 

Richard320

TFP Expert
LifeTime Supporter
Jan 6, 2010
23,932
San Dimas, CA (LA County)
Cloudiness after adding Calcium products is not uncommon, especially if pH is high. Your statement, "the next day after application, the water turned cloudy..." is where I'm concerned. Did you add the cal-hypo late in the evening and walk away so that you couldn't have seen it cloud things? Or did it go in fine and not cloud things but the next day it is? One scenario means normal, maybe with high pH, the other means you were too late and now you have an algae bloom.

If it clears up, it was nothing. If the pH is high and you add acid and it clears up, it was high pH. And the test for algae, which you can do this evening, is the Overnight Chlorine Loss Test
 

primuspaul

Well-known member
Sep 3, 2018
92
NYC area
Cloudiness after adding Calcium products is not uncommon, especially if pH is high. Your statement, "the next day after application, the water turned cloudy..." is where I'm concerned. Did you add the cal-hypo late in the evening and walk away so that you couldn't have seen it cloud things? Or did it go in fine and not cloud things but the next day it is? One scenario means normal, maybe with high pH, the other means you were too late and now you have an algae bloom.

If it clears up, it was nothing. If the pH is high and you add acid and it clears up, it was high pH. And the test for algae, which you can do this evening, is the Overnight Chlorine Loss Test
I will do this tonight and test pH as well.
Please post a full set of test results.
TA and pH levels can make cal hypo cloud your water.

Are you adding chlorine every day?
No.
 

primuspaul

Well-known member
Sep 3, 2018
92
NYC area
I tested FC after sundown and just after dawn and got 13, then 12.5. And yes, I did remove the trichlor tabs overnight to avoid having them influence the readings.
pH=7.5
Calcium test = 7 drops to turn blue = 175.
 

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