Question Pool Build

[Dstant_Thunder]

Hi Everyone -
I'm going to be a new pool owner, and I had this concern. They are currently building my pool and it will be around 16,000 gallons. My question is that around my waterline tile, right below the coping is allot of white discharge running down the tile (Please see picture's). My project manager told me that before they plaster the pool and in my case "Pebble Tech" it. They do an acid wash and that the white material will be removed. I guess my worry is that if this is doing this from a spot above waterline will this keep coming back? Is there a way to fix it? I'm not sure but I don't believe the pebble tech go's up that far to cover it up. Thank you in advance for all your knowledge and support -

P.S. - I wanted to EDIT my original post - I guess I have these questions:
1. This is a "NEW" pool build - so should I be making the pool contractor fix this somehow, as in permanently before water is added or plastered?
2. They have to acid wash the pool before plastering and he told me at that time it would be removed. That's all well and good but will it come back? Please note the material is coming directly above the pool tile and right below the coping. No decking has been installed as of yet.

 

[ajw22]

That looks like efflorescence.

What is Efflorescence & How to Remove Efflorescence? | NMP

Efflorescence is a crystalline deposit of salts. Typically found on porous materials that are exposed to moisture. Learn how to prevent and remove it.

www.nitterhousemasonry.com

It looks like water is running under the coping and coming out of that point and carrying salts from the ground and depositing on your tile. We don't see pics of what is going on with your coping and deck.

 

[Dstant_Thunder]

There is no deck as of yet, this is all new. On the other side of the coping is about a 6 inch drop to the ground which is all dirt. No water can infiltrate that area except the rain hitting the coping. I def agree that its efflorescence.

 

[ajw22]

There is no deck as of yet, this is all new. On the other side of the coping is about a 6 inch drop to the ground which is all dirt. No water can infiltrate that area except the rain hitting the coping. I def agree that its efflorescence.

Then rain water is draining through the stone or grout lines to create the efflorescence.