Best Answer

Usually this is the result of converting copper sulfate stains (turquoise) to cupric oxide (grey-black) by oxidation from the shock (calcium hypochlorite) sitting directly on the copper stains. Avoid this by shocking with liquid chlorine or pre-dissolving the granular shock so it doesn't sit right on the plaster. Often the grey-black stains can be reconstituted to turquoise sulfate by letting alum (aluminum sulfate) sit on the same spot. This has to be done relatively soon, though, before calcification covers the stains with a layer of carbonate that the alum can't soak through...

User Avatar

Wiki User

โˆ™ 2004-08-04 16:39:30
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: Why does the plaster in a pool seem to burn or turn black after adding shock treatment?
Write your answer...
Related questions

When can you swim after adding algicide and shock?

A person can go swimming in a pool a few minutes after adding algae treatment and shock to the water. This is provided that a low dose was used. The manufacturers of the algae treatment recommend that a person waits 45 minutes to an hour to swim after adding a normal dose.

What is the treatment of electric shock?

An electric shock will stop the heart, treatment for this is CPR.

Which is not a part of the treatment for shock?

Many, many things are not part of the treatment for shock. The question needs rephrasing.

How soon can you get in the pool after adding shock?

about 6 hour after shock or sooner if you use a shock and swim

If you have a gunite pool that has been stained due to a shock treatment can this be reversed or will it have to be painted and what are your options?

Hum, what kind of shock treatment would stain your pool. What color is the stain. Brown? Not the treatment. Iron in water - should run filter for 12 hrs after refilling or toping off the pool and adding a treatment or chlorine. Your plastered pool most likely was not painted unless you know this for a fact. Plastered pool are not painted unless you are trying to hide something. The staining can only be removed by the process of a light acid wash of the plaster. Treat your pool with a sequestering agent or stain out product once in a while to prevent this in the future. Follow label instructions. k

What is salt shock?

Adding a great amount of salt in a single step is a salt shock.

Is shock treatment legal?

Yes, shock treatment (also known as electro-convulsive therapy) is legal and is still performed by psychiatrists.

When was Shock Treatment - Edgar Winter album - created?

Shock Treatment - Edgar Winter album - was created in 1974-05.

What was ECT first called?

"shock treatment."

How was shell shock treated?

Various forms of treatment for shell shock have been tried. Psychotherapy and psychiatry are usually used nowadays. During and after World War I, electric shock treatment was sometimes used.

How reduce insanity by shock treatment?

I have never heard of someone getting shock treatment to induce insanity but to reduce depression. one flew over the coco's nest with jack Nicholson & Louise fletcher was just a bit inaccurate in the things that shock treatment were done for.

What is the treatment of shell shock?

Shell shock is mostly referred to as anxiety and post traumatic stress disorders. The treatment for this is regular psychiatry visits and possibly medication.

What is the prognosis for shock?

The prognosis of an individual patient in shock depends on the stage of shock when treatment was begun, the underlying condition causing shock, and the general medical state of the patient.

How do you clear green pool water?

Shock treatment.

What is the second step in shock treatment?

maintain airway

What are the steps of shock treatment?

Ensure casualty is breathing.

Is not part of the treatment for shock?

there is not enough information to answer this question

Insulin shock is a form of what?

over treatment of insulin

What was Electroconvulsive therapy first called?

"shock treatment."

What is the first aid treatment for electric shock?

Electric shock will cause central nervous system failure which leads to respiratory and cardiac failure - hence the treatment will be CPR.

Do you need to turn off your automatic salt chlorinator when adding shock to a salt water pool?

By Shock I guess you mean a packet of Chrlorine marketed as "Shock or "Shock Treatment" which is esentially just chlorine packaged at a higfher price. Any ususal powdered or liquied chlorine will do the same job except those that are Di chlor or tri chlor. No need to turn of the salt chlorinator at all.

If shock is sitting at the bottom of a pool how do you clean it?

Rephrase the question. What type of shock have you used? Is it a calcium based shock treatment? Supply more info.

How soon can you shock your pool after adding stabilizer?

Any time you like

How long after adding shock can you add alkalinity to a pool?

24 hrs

What does STU stand for?

STU stands for Shock Treatment Unit