New Build Calcium Nodules

mstymndy

Member
May 6, 2021
7
Dallas
Surface
Plaster
Chlorine
Liquid Chlorine
Hey there.

So our pool was plastered at the end of June. In the last 2 weeks we noticed calcium nodules on the plaster, mainly along one wall that are just getting bigger. We called the pool company and they sent someone to scrape them off, but researching it and talking to my pool technician, it sounds like it may be indicative of a bigger problem? The pool company is saying that it's water intrusion from behind the plaster off the gunite that is perfectly normal and that using sc-1000 will help balance it, but everything I read online says that its a deficiency in the plaster itself. Thoughts?? I'm not sure how I should proceed. I have no desire of replastering my entire pool, but I also don't want to just live with it if there is something actually wrong with the plaster.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
44,404
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40

Some information on them.
 

mstymndy

Member
May 6, 2021
7
Dallas
Surface
Plaster
Chlorine
Liquid Chlorine
Hey there.

I was directed to this thread educating about calcium nodules which I've been researching quite a bit lately. So our pool was plastered at the end of June. In the last 2 weeks we noticed calcium nodules on the plaster, mainly along one wall that are just getting bigger. We called the pool company and they sent someone to scrape them off, but researching it and talking to my pool technician, it sounds like it may be indicative of a bigger problem? The pool company is saying that it's water intrusion from behind the plaster off the gunite that is perfectly normal and that using sc-1000 will help balance it, but everything I read online says that its a deficiency in the plaster itself. Thoughts?? I'm not sure how I should proceed. I have no desire of replastering my entire pool, but I also don't want to just live with it if there is something actually wrong with the plaster.
 

mstymndy

Member
May 6, 2021
7
Dallas
Surface
Plaster
Chlorine
Liquid Chlorine
They're still relatively small (small pea sized) so hard to take pics of underwater... especially with an iPhone when it's bright, but this is what I've got. There's about 20 of them though.

FE36FBF7-317C-4C41-BD79-79A5A108E767.jpegD1142208-EA15-45BC-BE72-CCA0BE76FBF8.jpeg
 

onBalance

TFP Expert
LifeTime Supporter
In The Industry
Jul 25, 2011
1,218
Utah
Ok, that does look like two small calcium nodules. However, why is there a very large white discoloration outer ring from the small nodule? To help me, perhaps two photos from a little further away?
 

onBalance

TFP Expert
LifeTime Supporter
In The Industry
Jul 25, 2011
1,218
Utah
Okay, thanks for clarifying.
What the pool company told you is wrong. But since the nodules are very small, there is a good chance that scraping or sanding them off may resolve the problem. Get the company to acknowledge the problem in writing, and then allow them to remove by scraping or sanding without draining. Wait a few months and see if more nodules form again. If nodules return, IMO, they should re-plaster the entire pool.
 
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