What is this around our pool

[warrington]

It is on the grout around the edge. There is also a large white streak on the outside along the rock. Doesn’t look like it leaks at this location

The white doesn’t flake off and doesn’t come off with like away




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[warrington]

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[Walker]

Is it a saltwater pool?

[lanceodom]

We have the same thing. From what I understand it’s some sort of mineral buildup from the concrete behind through the grout. I’m guessing the concrete subwall should have been sealed before the tile and grout were installed??? We power wash it off. It stays gone for a few months then slowly comes back. Good luck.

[texaswoods8]

It's calcium build up from hard water. Make sure your water is balanced (PH &Alk) and it will help by keeping the calcium in suspension. When water gets out of balance minerals come out of solution and stick to things. Also the lines on the outside of the limestone is also calcium build up probably from it leaking through the mortar joint and following the path of least resistance.

[Pstraw]

There was a thread about this a month or so back. I don't remember what it is called but I think that it was something in the concrete. I may be wrong as I didn't stay at the Holiday Inn last night.

[warrington]

Chlorine with ozone

[flywise]

https://blog.orendatech.com/weepers-efflorescence-and-other-concrete-pool-shell-problems

[Floor Man]

Efflorescence


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[Bigdaddy]

Looks like calcium
Stagalites. Usually from
Calcium build up. Water may be on the harder side. Try some water softener in the pool system.

[Low Fence]

It’s called efflorescence. Basically the evaporation of water through the mortar pulls the minerals of the Portland to the surface. The moisture evaporate off and leave the deposit. It can be cleaned but will usually just reappear

[warrington]

TBH is the best knowledge I can find

Appreciate

[mjhaverkamp]

Efflorescence


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This

[Rustled Again]

Listen to Haverkamp. He knows.

[ecallarman]

I believe you can clean it off using a diluted mixture of water/muriatic acid.