Strange Stains

[agaeto]

Does anyone know what might have caused these stains around the drains in the deep end of our pool? It’s a quartz pool. I’m sure I caused this in some way before I knew what I was doing and understood how to properly maintain the pool. Just wondering if there’s any way to remove this or what it even is. The pool is 9 feet deep in the area that is stained.

 

[mknauss]

The stains appear to be white/light in color? Did you use chemicals you broadcast into the pool? Cal hypo, dry acid, dichlor, etc?

 

[agaeto]

No I think the white spot you’re seeing is just a reflection in the water. The stain I’m asking about is the larger ring that looks like a water mark around the drains.

 

[mknauss]

OK -- I see it now. That looks like a ring that occurs if water is let to sit on the new plaster without continuously filling the pool. Do you remember when they plastered, did they start adding water and not stop? Or did they do an acid wash?

 

[agaeto]

They let water sit on it when they plastered it. I don't think they did an acid wash at all.

 

[mknauss]

If water sat there, it is a ring that will take a very long time to sort of get better. Nothing you can chemically or mechanically do.

 

[agaeto]

Ok I just looked through a bunch of photos. It definitely did not happen when the pool was plastered. It was something after the fact that I did to it before I knew how to properly manage the chemicals. I may try and swim down there and use a pumice stone on it to see if that helps.