Maybe is the chemical that you put on your pool. This is happen when you don't dilute the chlorine powder or others chemical before the application. This white film can be remove with cleaners containing acid, this accion give better results when it use a scrubbing brush.
The white film on the sides of a fiberglass pool is likely the result of mineral build up. You can find products at your pool store to help remove this build up.
Richard Cocksmith and the Above-Ground Pool - 2008 was released on: USA: 16 October 2008 (Austin Film Festival)
Facts about the actors and film appearing in large white lettering along the bottom of the screen.
The duration of Common Ground - film - is 1.75 hours.
The duration of Higher Ground - film - is 1.9 hours.
Common Ground - film - was created on 2000-01-29.
Higher Ground - film - was created on 2011-08-26.
Ripley Under Ground - film - was created in 2005.
The duration of Ripley Under Ground - film - is 1.68 hours.
The duration of This Above All - film - is 1.83 hours.
The duration of Above the Law - film - is 1.65 hours.
You will have to find a film company that develops the film to get the 120 film writings on top and bottom of your photos.
This Above All - film - was created on 1942-05-12.