I think what you are refering to is called mottling. It can be caused by over working the marcite as it is applied. It can also be caused by improperly mixing the finishing product.
Pebble finishing for a pool's surface has its perks in terms of increasing the surface life of the pool finish, but indeed it can cause bruises; However, I haven't heard anyone getting a splinter from Pebbled pool surface. That can only be possible if your pool is unmaintained causing twigs or anything that can cause a splinter to enter the pool unnoticed.
Too much iron in a pool can cause things to turn black. Speak with your pool shop about the right treatment.
No its not
High calcium can causeSkin and eye irritationCloudy waterClogged pool filtersPoor filtrationCalcium build-up and corrosion on heatersScaling of the pool waterReally the only way to reduce calcium hardness is to partially drain the pool, 1/3, then refill. It may cause staining but that would be the least of your worries if you had a heater.
What about "sweep a new pool surface"?
Are you looking for solar covers? Above ground or inground pool? ANSW:: If you are talking about the pool shell and finish itself and not the surface of the water then the darker the finish the better. Black, in So. Calif, is and has been a current favorite. But you have to deal with that "lagoon" look. There are people who do not like that look. A disadvantage to the black is that if you are not dilligent with pool chemistry you can end up with black algae....it is hard to see in a black finished pool. Another is that, again, if you are not right on with chemicals you can end up with a nearly white pool within a few years. It could be calcium buildup ( white to gray look - aggressive water - high pH ) . It could be, again, aggressive water ( low pH ) sometimes loosing the cobalt in the plaster or "butter" coat - degrading the plaster to a point where the color simply is dissolved and goes int suspension. k
Because the Yersinia pestis bacteria forms back boils on the surface of the skin. Look at the picture at the link below to answer your question. Internal bleeding also cause blood to pool under the skin, turning it black.
The stains could possibly be from copper. Your pH may be or has been below 7.0. Check your pH and Total Alkalinity and adjust. k
Sugest you have a talk with your poolshop before you do anything I have never seen a black algae contamination as bad as you describe. IE it may not be black algae.
The Pool of the Black One was created in 1933.
If it is a rectangular pool, then multiply the length by the width. If it is a circular pool then the surface area = (Pi/4)*(diameter^2)
Some pool cleaning products are Surface Magic Water Surface Cleaner,Pool Perfect, Polaris pool cleaner,Chlor Brite Granular Chlorine, and Hayward Pool Vac XL.