How to treat swimming pool water to make it potable.

Take a manageable amount of water from your pool and run it through a cloth filter such as a Milbank bag to remove the large particle matter. Then add chlorine to this water, wait for the proscribed length of time for the chlorine to work. Only after this time is up add Alum to the water and leave to settle. Alum is a flocculent that attracts impurities including chlorine and settles on the bottom if the container, the water above the layer of alum is safe to drink just be careful not to disturb the alum