Brown staining on pool walls and fixtures is usually from a high iron content in the water. The chemical reaction with newly added fill water and the addition of chlorine shortly after will cause a fallout of this metal. I have witnessed this years ago after adding a gallon o f chlor. to a newly filled pool and just watched the brown cloud form and fill the pool to a chocolate brown color.
There are chelating agents to prevent this from happening.
k
First you have to determine if is in fact a painted pool. If it is a plaster pool then usually there is no paint unless it was painted because of age and damaged plaster. You most likely do not want to paint a plaster pool - have it acid washed to clean plaster. Not sure how to determine what type paint. You would have to have the paint chips anaylized to determine if it is a chlorinated base paint or epoxy paint. Ken
yes. Plaster of Paris is a powdered rock made from the mineral gypsum.
Abrasives are found in the plaster of Paris.
Frescos are painted directly onto wet plaster.
It is a mixture of gypsum, a naturally occurring mineral, and water.
Gypsum
Frescos are painted directly onto damp plaster on walls.
biotite mica is used to make plaster and other construction materials
Plaster itself is not poisonous. Some people are allergic to it but generally you will only have a reaction to it if you consume it. Plaster of Paris may cause breathing difficulties if inhaled. Wall plaster is harmless once it is painted and/or covered, and contact with it before that is fine. Painted wall plaster is safer as it does not release dust.
PebbleTec lasts longer than plaster (and is usually warrantied for longer than plaster). In addition, it is darker so typically hides the staining that often comes with pool chemicals.
Gunite is covered with plaster. It is sprayed on concrete sorta. They mix it in the hoses and it is blown on. You can go to youtube and see them gunite a pool. I am only aware of plaster, vinyl or painted pool surfaces. The vinyl is just like thin rubber.
Gypsum