New concrete pool - is plaster suppose to be blotchy?

[mbar]

The way you can tell if the stain is from metals is to use some ph down, or crush some vitamin C tablets up and put them in a sock, or stocking and rub them on the stain, if the stain goes away, it is a metals stain. If it stays, then it is from something else.
It is fine to aerate and treat a stain too - it is good, because you have to keep the ph low to do both.
I can't tell you about the mottled look of the plaster, but if they are metal stains they will come off with the vitamin C or ph down. If they are metal stains, this treatment should help - if it doesn't they you can get rid of them by using ascorbic acid (which is vitamin C). This will take the stains off the surface of the pool, and the Jack's Magic is a sequesterant which will hold the metals in suspension. The sequestering agent (Jack's Magic) will sometimes help lift off newly formed stains, but if they are too embedded they will have to be removed by using a stain treatment, such as ascorbic acid.
Sequestering agents can sometimes lower ph - I know that Jack's Magic does.

Hope this helps, feel free to ask any questions you may have.

[JonnyG]

Marie, thank you for your help. The pools guys (from the construction company) were here today for indoctrination and they told me the "marble" look (as they call it) is normal and due to the plaster containing marble dust. That sound right to you? It sorta is marble lookie but not sure that I really like it.

Let me know if that sounds fishy or not.

Thanks
John

[mbar]

I am sorry, but I just don't know - I have a fiberglass pool, and most of the friends I have aslo have fiberglass or vinyl liner pools. You can ask the question in the pool construction forum - I'm sure someone will be able to help, or point you in the right direction.

[JonnyG]

Thanks! I appreciate your help.