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The water turned green probably due to algae growth. The algae grew due to a lack of santizer (chlorine or other). While the alage was growing, other bacteria or organisms probably also grew, you just can't see them.
Therefore, it generally isn't recommended to swim in a pool while it's green because the water may not be entirely sanitary.
This is true even if the chlorine level is sufficient. You have to give the chlorine enough time to kill everything.
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Ezra
Rafawell first u put chlorine in your pool water then you shock it. if shocking it doesn't work then consult a professional.
That last answer was from someone who is clueless. First check your alkalinity. If too low (80 or less) than any shock you put in the water will not work and your throwing your money away. Add baking soda (from Sam's 5.50 15 lb) accordingly and then shock it when level of alkalinity is reached. This is a tried and true lesson I learbed and saves me a lot of money. If the water is real green to start, use Yellow Out and then follow the above instructions.)
NO
NO
A LITTLE BIT of algae isn't going to hurt you. If you ever swim in a lake, river or ocean, there's algae present there. You probably even carry the algae home on your swimsuit.
But the pool needs to be treated as soon as you notice it, since a pool doesn't have the properties of moving natural water to keep the algae under control. It's an ongoing battle to keep enough chlorine in the water to avoid algae, while not putting to much chlorine. The EPA states the limit of chlorine exposure to humans should be no more than 4 parts per million. So don't just dump load and loads of chlorine in to solve your problem. A retail pool store can test your water and advise how much chlorine and/or algaecide is needed to get rid of it. You may need to get the chlorine up to 5 ppm to kill the algae. Just wait until the level drops below 4 ppm before you swim again.
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