Raised spots in plaster

[detroit54]

Hi all,

I was swimming last night with the light on and noticed some raised spots in the plaster in a couple areas in this pool. Any idea what these could be? I did notice the calcium hardness was around 200 when I tested it with a tailor k 2006 kit. Could this be related to hardness?

Thanks

 

[ajw22]

Are you sure those spots are new and have not been there since the plaster was installed?

How old is your plaster?

 

[detroit54]

Are you sure those spots are new and have not been there since the plaster was installed?

How old is your plaster?

No, I'm not sure, we just moved in a little over a month ago. The pool was resurfaced in 2021. Seems like shoddy work if the spots were there since replaced, since they are raised enough to feel and see them, but they probably went with the lowest bidder. If it's nothing to worry about, I can live with it.

 

[ajw22]

I think it is just shoddy work. Catalog the spots you find and let's talk again if new ones pop up.

 

[proavia]

If you CYA is still at 100, your FC is way too low.
FC/CYA Levels

 

[1poolman1]

No, I'm not sure, we just moved in a little over a month ago. The pool was resurfaced in 2021. Seems like shoddy work if the spots were there since replaced, since they are raised enough to feel and see them, but they probably went with the lowest bidder. If it's nothing to worry about, I can live with it.

Calcium nodules. You can sand them off. You can blame the plaster manufacturer, or the bond coat manufacturer, or the re-surfacing company, or the person that filled the pool (perhaps too slowly), or the person that did the start-up, or the the water table in your area, or all the above. Not an issue with water chemistry.

 

[Jimrahbe]

54,

I have Calcium Nodules on a re-plastered pool at a rent house... Started about two or three years after the re-plaster..

They may start out a 'bumps' but they quickly turn into little calcium volcanoes.. They can get an inch or so high and wide. They are caused when the original plaster delaminates from the gunite, and just like a pimple, they fester and then erupt at the surface.. You can sand them down, as I did, but that fixes nothing, they just come back. And for everyone that does not come back, new ones form..

The only fix is to remove all the plaster down to the gunite, and re-plaster. Hopefully by someone that has a clue what they are doing..

Sigh,

Jim R.

 

[detroit54]

If you CYA is still at 100, your FC is way too low.
FC/CYA Levels

I bought a Taylor K2006 kit and tested about a week ago,
FC was 3.5 PPM
CC was 1 PPM
pH 7.6
TA 70
CH 200
CYA 70

I cranked up the SWCG for 24+ hours and got FC to 13.5, CC 0.5ppm, then put it back to 5-6 hours/day and measured 9 ppm FC this morning. I'm still learning and trying to figure out the right way to operate the pool, vs pump, and SWCG. Tons of rain lately, so I'll test other levels and reply later.

 

[detroit54]

I just tested again:

FC 9.5ppm
CC 0.5ppm
pH 7.4
TA 60
CH 190
CYA 60

Leslie's salt test strip between 3000 and 3500ppm

I am running the SWCG at 75% output for 5 hours from 8am to 1pm.

I'm.guessimg I need to raise CH quite a bit. Er, I just read more and the previous comment about calcium nodules not being caused by water chemistry clicked. Should I still raise CH? Will it make the pool water feel hard?

 

[proavia]

Keep FC near the top of the target range for your CYA FC/CYA Levels
Raise the CH to 250-300
TA of 60 is fine - it will slow pH rise
Allow pH to hover around 7.8

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[detroit54]

I added 25 lbs Leslie's hardness increaser yesterday, have 350 ppm CH now. I also added info to my signature as requested. Thanks!