Weird deep end stains in new fiberglass pool

chazas

LifeTime Supporter
Jun 4, 2007
160
Manassas, VA
My pool guys literally just turned maintenance of my new white fiberglass pool over to me this week, though it has been in the ground a couple of months.

There are some weird geometric stains in the deep end that don’t come up with brushing. They almost look like something scratched it. I have been running a new Pentair Warrior SI cleaner ever couple of days, but I can’t see how anything on that would be abrasive enough to affect new gelcoat. The pool sat in my front years for a couple of weeks before it was installed this winter, with dirt and leaves ion the deep end, but this doesn’t look like something from that.

Anyone have any idea what this is?A9DE9927-F623-43D1-BFA4-BCB95790F536.jpeg
6F064EB3-26AD-4874-BF8A-4E878D89CD5B.jpeg
 
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chazas

LifeTime Supporter
Jun 4, 2007
160
Manassas, VA
Those “lines” are tree debris from an odd tree. It’s not them, it’s the fainter lines towards the middle of the deep end. More visible in the first photo.
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
The very faint squiggly lines right? Those are odd. I suspect the water is still too cold to get in there. You might try using a brush pole to hold & rub a thin sock or nylon containing a few crushed-up Vitamin C tables in it on the stain. See if that helps. If not, try the same with a chlorine tab/puck directly on the stain, but don't let the puck stay in one spot. My hope is that something organic dripped or laid in such a way that if left a temporary stain (liek tannin), but that is a really odd formation.
 

chazas

LifeTime Supporter
Jun 4, 2007
160
Manassas, VA
I will try both. I have another idea what it might be. We had a heavy rain last week and there were a lot of dead worms in the pool, most of them had drifted down to the deep end before I ran the robot. Could be robot worm smushage. Doesn’t answer why it doesn’t come up with a brush, but that’s the only thing the cleaner could have done I can think of.
 
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chazas

LifeTime Supporter
Jun 4, 2007
160
Manassas, VA
There also was some gritty debris in the pool from some work they’d done on the concrete cantilever. If the robot scratched the pool with that, it would be a much worse answer. TBD I guess.
 

chazas

LifeTime Supporter
Jun 4, 2007
160
Manassas, VA
I tried the puck trick, hard to tell. The area where I left the puck might be a little bit lighter, but it also might be my imagination. I turned the SWG up just in case it’s biological. Tomorrow, the Vitamin C tablet trick.
 
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Texas Splash

Mod Squad
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No luck with the Vitamin C either, I am bummed. I have notified my pool builder.
Certainly is odd. Well, let us know what your installer thinks. The only other thing I don't think you tried was dry acid (for copper) - in a sock as well. But it doesn't seem to fit that scenario. Curious to hear what you find out.
 

chazas

LifeTime Supporter
Jun 4, 2007
160
Manassas, VA
Consistent with what all contractors think, I'm sure it will be, "it's supposed to be like that" and I'll be fighting with them and Barrier Reef for a year, which bums me out. (I am still fighting with a high-end stove company for a replacement of a cooktop installed last July that was obviously and visually defective - I'm very stubborn, but don't like to have to to it.)

Certainly is odd. Well, let us know what your installer thinks. The only other thing I don't think you tried was dry acid (for copper) - in a sock as well. But it doesn't seem to fit that scenario. Curious to hear what you find out.
 

chazas

LifeTime Supporter
Jun 4, 2007
160
Manassas, VA
He tried a pool eraser on a pole - no effect. And a couple more spots have shown up, also mechanical-looking. The only thing I could possibly have done is the robot - but it's a standard Pentair-branded Maytronics. There's nothing on the bottom of it that would have scraped the pool - what touches the pool is the treads and there are two of them, not single track like the stains, and my google searches haven't turned up a single instance of a pool robot staining a pool surface.

The installer is going to reach out to Barrier Reef. TBD I guess. I'm not happy.
 
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chazas

LifeTime Supporter
Jun 4, 2007
160
Manassas, VA
I updated this in my build thread, sorry. The textured finish was either not applied in or at some point scraped off of these areas. I have as of yet not had a definitive response from Barrier Reef on this. My PB is following up and I am keeping on them, but TBH they are letting this and one other “fix” item slide, and I’m not particularly happy about that.