New Plaster & Cloudy Water

vnkt0207

LifeTime Supporter
Jun 17, 2014
38
Eastern Shore, MD
Day 3 with new plaster. Per instruction, I went to put bleach in the pool for the first time since being applied. The pool water was cloudy also for the first time.

Earlier, I added enough bleach to get to FC=3. But 30 mins later, I measured zero FC. Later I added the rest of the gallon of bleach but still with zero FC. Complete nunbers below. The plaster has been brushed twice daily since being installed, but the water has never been cloudy before today.

FC=0
CC=0
pH=7.4
TA=110
CH=170
CYA=0 (per plaster instructions)
Temp = 52F

Thoughts and recommendations would be great.
Thank you.
 

mknauss

Mod Squad
TFP Expert
May 3, 2014
13,841
Laughlin, NV
Ahh -- surfactants. That can easily cloud your water.

Be sure you get fresh chlorine. Look for the Julian date on the bottle. 19XXX. XXX is the number of days into 2019 the bottle was filled.
 

vnkt0207

LifeTime Supporter
Jun 17, 2014
38
Eastern Shore, MD
Browsing other posts, something related to this string for the new plaster, builder added a quart of Orenda SC-1000. I know that it will defeat any chlorine added to the pool. It was only applied once in the early evening of 10 April which was also the fill day. So low long will SC-1000 keep killing the chlorine? The company that installed new pool equipment recommended using Trichlor pucks, but not sure I trust that advice. Kind of lost here - any recommendations would be great.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
4,463
Northern NJ
When does your plaster instructions say you can add CYA? It is usually after day 4 to bring CYA to 30.
 

vnkt0207

LifeTime Supporter
Jun 17, 2014
38
Eastern Shore, MD
Instructions are to add CYA to 30 AFTER day 4, which is tomorrow. I am pre-dissolving it in a bucket today.

Today though, the cloudiness is mostly gone for unknown reasons. I will try again with enough bleach to get FC to 3 ppm and see if I can get a measurement.
 

vnkt0207

LifeTime Supporter
Jun 17, 2014
38
Eastern Shore, MD
Just checked FC and it is zero still, even after adding enough bleach to get to FC to 3 ppm. pH was also high at 8.0 so I added muritatic acid to get down to 7.4.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
4,463
Northern NJ
Just checked FC and it is zero still, even after adding enough bleach to get to FC to 3 ppm. pH was also high at 8.0 so I added muritatic acid to get down to 7.4.
For best hardening of your new plaster it is recommended that you keep the CSI between 0 and +0.5 for the first 30 days. See The CSI is Reliable for Plaster-based Pools

Keeping your pH at the upper end of the recommended range and getting your CH above 250 when allowed should get you there. Use PoolMath to calculate your CSI.

Keep adding chlorine and eventually it will hold.
 

vnkt0207

LifeTime Supporter
Jun 17, 2014
38
Eastern Shore, MD
Day 5 of new plaster. This morning, I put enough fresh bleach in to get FC=3 ppm with no measurable amount after with the test kit. Also put enough CYA in to get 30.

This evening, I got the following numbers:

pH = 7.8
TA = 120
CSI = +0.22
 
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