Vitamin C worked - now what?

Hisbestcatch

Well-known member
Mar 21, 2020
50
Melbourne, Fl
Our pool was filled in October and water chemistry has been perfect and my husband is diligent about following TFP for chemistry!

About a month after fill, we noticed a halo around a ‘larger’ pebble in our finish. Only 1 spot on vertical wall of sun shelf (CL industries pebble). It never got much worse, never got better, about the size of a dime. We thought it may have been a void in the finish, especially since every other area is perfect. I’ve attached before and after photos the best I could get them!

Tried the vitamin C today and the halo immediately disappeared with that ‘larger’ rock remaining (we think it’s a rock) :). My understanding is that it’s iron.

I’m worried this means the rebar may be coming through..? This is the only spot and everything else looks great!
If the halo of rust appears again around that same area, what is that telling me? If it doesn’t reappear, what would that tell me?

Since it’s on a vertical surface, we are able to rule out a metal object causing it, etc.



Your help would be appreciated!!
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ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
26,293
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
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Pentair Intellichlor IC-60
It means you have some rebar near the surface that is rusting. It is cosmetic and you can ignore it.

Only fix is to chip out the plaster and gunite to expose the rebar and cut it out. Then fill the hole with hydraulic cement and replaster.

How old is your pool?
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
31,494
Texas, San Antonio/Marion, South-Central Area
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Our pool was filled in October
Definitely something to discuss with your builder. Still under warranty. But don't let it get you too upset. Structurally you are fine, no leaks, etc. But under warranty the builder should have some good remedies for you.
 
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ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
26,293
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Talk to your Pool Builder and see what he suggests. There is no quick fix if it is rusting rebar. Maybe a piece of a nail got in the plaster and can be chipped out. Whatever the fix will leave a scar.
 
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Hisbestcatch

Well-known member
Mar 21, 2020
50
Melbourne, Fl
Talk to your Pool Builder and see what he suggests. There is no quick fix if it is rusting rebar. Maybe a piece of a nail got in the plaster and can be chipped out. Whatever the fix will leave a scar.
In your opinion, would this be a plaster company issue or the pool shell guys issue? When it comes to warranty.
 

JamesW

TFP Expert
Mar 2, 2011
25,745
The builder will probably want to cover it with epoxy putty and "keep an eye on it".

As noted above, the rebar will need to be cut out and patched.

Overall it's not a huge problem.
 
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ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
26,293
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
In your opinion, would this be a plaster company issue or the pool shell guys issue? When it comes to warranty.

The problem is owned by the PB and shared by the rebar contractor who placed some rebar too high and the gunite company who did not put enough thickness over the rebar. The PB should have been watching over the gunite job and caught it and had more gunite thickness added.
 

Hisbestcatch

Well-known member
Mar 21, 2020
50
Melbourne, Fl
The problem is owned by the PB and shared by the rebar contractor who placed some rebar too high and the gunite company who did not put enough thickness over the rebar. The PB should have been watching over the gunite job and caught it and had more gunite thickness added.
The builder will probably want to cover it with epoxy putty and "keep an eye on it".

As noted above, the rebar will need to be cut out and patched.

Overall it's not a huge problem.

They mentioned “hydro cement”. Isn’t this a bandaid? What would they be watching by doing that?
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
26,293
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
They mentioned “hydro cement”. Isn’t this a bandaid? What would they be watching by doing that?

Are they cutting out the rusting rebar first or are they are just trying to bury it deeper so the rust does not show.

There will be some scar from the fix.
 
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JamesW

TFP Expert
Mar 2, 2011
25,745
They might just put something over it to buy some time and hope you forget about it.

To really fix it, they need to cut it out and patch.

You will see the patch, but in the grand scheme of things, it's not a big deal.
 
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Hisbestcatch

Well-known member
Mar 21, 2020
50
Melbourne, Fl
Are they cutting out the rusting rebar first or are they are just trying to bury it deeper so the rust does not show.

There will be some scar from the fix.
Are they cutting out the rusting rebar first or are they are just trying to bury it deeper so the rust does not show.

There will be some scar from the fix.

When I First mentioned it to them in November they never showed up. When I brought up my concerns again today they just said we can put hydro on it. It wasn’t anyone from the shell company. Just one of their workers. I will make sure to push to have it corrected right!
 

JamesW

TFP Expert
Mar 2, 2011
25,745
Make sure that the pool is vacuumed well after the patch because the metal dust from cutting the rebar will settle and cause metal stains if it's not vacuumed up.
 
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