White ring at water line.

[rmturner54]

I just noticed recently after my water had dropped due to evaporation that there is a white ring around my fiberglass pool.
Is that calcium and what can i use to clean it without damaging the finish

 

[pooldv]

It is likely calcium scale due to high pH and/or high TA. More here, Pool School - Lower Total Alkalinity

It is also possible that it is a gelcoat issue. Gelcoat issues present with symptoms similar to calcium scale.

Test results will help.

 

[rmturner54]

I giess i need ro contact Viking

 

[rmturner54]

My csi is -0.37, ph stays fairly stable at 7.6 with a ta of 90.

 

[rmturner54]

I ordered a product called Off the wall, recommended by pool mfg. Will update

 

[pooldv]

My csi is -0.37, ph stays fairly stable at 7.6 with a ta of 90.

If these numbers are typical then it is not calcium scale.

 

[pooldv]

My csi is -0.37, ph stays fairly stable at 7.6 with a ta of 90.

If these numbers are typical then it is not calcium scale.

There are some more in depth discussions about it here, White deposits covering Fiberglass pool

And here, Calcium scale and negative CSI in fiberglass pools

 

[rmturner54]

Thanks for the info. I will b looking at it

 

[rmturner54]

Thia white looking ring is actually 4 in below normal water level. I tried my fingernail to scratch on it. No change. Its as smooth as fiberglass. The whit progresses up on the fiberglass. I contacted my viking dealer and he is submitting a repair order
I never could get a reply from viking

 

[rmturner54]

Finally got an email from vikimg. They sent me a procedure to do gather data and a repair request form

 

[rmturner54]

Finished the discoloration test for Latham/viking pools. Entire surface below water line is white. Drained pool to exspose 1st step, did MA test w no reaction, performed 220grit sandpaper test under water....3mins, exsposed original color.
Now waiting to see what mfg says.
My PH very raely got to 8 or above in 4 years. I have a 4 yr spreadsheet to prove it

 

[rmturner54]

A little late on update. I got a very longexplanation from viking latham pools. As expected they arent going to do anything, said water chemistry to blame.
However my chemistry has been pretty good since installed 4 yrs ago. They will fixed it of course for $8000 to sand surface and put on a product called aquabrite

 

[Texas Splash]

A little late on update. I got a very longexplanation from viking latham pools. As expected they arent going to do anything, said water chemistry to blame.
However my chemistry has been pretty good since installed 4 yrs ago. They will fixed it of course for $8000 to sand surface and put on a product called aquabrite

That is about the exact same response I and others received. Standard template I'm assuming. Quite disappointing to say the least. You might want to review my experience if you haven't see it already:
Fiberglass Discoloration (Faded Chalky) - My Story