Why is your pool water foggy?

You're pool has run out of cholorine. Without a sanatizer your pool will turn cloudy and then green. Shock it right away and make sure you have enough chlorine to sanatize.

You also have to run the pump longer to filter out contaminants. You are not adding enough chlor

I have a question what if your pool water goes from green to blue foggy water? Then what do u do to fix it? My dad has tried almost everything!