Brown Stains - From Abalone Shells?

[Jillstrub]

Moved from here.
I’m a new pool owner and just had stonescapes pebble put in my old pool. I saw an earlier post about abalone leaching protein and causing brown marks. I have these everywhere in my pool, on the bottom and on the walls. It started about one month after installation and more just continue to show up. Chemistry was balanced. Do you think it’s the abalone issue? They did sprinkle some in, no idea what kind. See photos, they look similar but also different than the post a saw. Mine look very dark, like rust. Thank you for any ideas! I still haven’t paid the last portion of my pool bill, as there have been many other unresolved issues so at least I have that going for me.

 

[HermanTX]

Yep. That is what it looks like. I only had 2 spots over 3 years now. They just dug them out and have a sealer they put in. I have the smooth polished surface so they just hand sanded it and it looks great. All of this was done underwater - did not drain the pool. He used a weight belt to hold himself down while doing the repair and holding his breath.

 

[TexasEd]

Did you see if they used the NPD abalone product when they plastered? I want to go with NPD Mini Pebble Aqua Blue with Abalone added and heard that the pool specific products have been heat treated to eliminate the brown spots.