Article: Pool shock has high levels of chlorine that wipe out the algae and sanitize the pool. Choose a powerful shock with around 70% available chlorine, which is enough to handle tough algae and bacteria. Follow the directions on the shock package to make sure you use the proper amount for the water in your pool. If you have a high amount of algae in your pool, you may have to treat it more than once to keep the algae from continuing to bloom. The water might look cloudy or dirty when you add the shock, but as the water runs through the filter it will begin to clean up. 0. Allow the algaecide to work in your swimming pool for at least a 24-hour period. When algae dies, it will fall to the pool floor or float in the pool water. It will also lose its green color.
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Treat the pool with pool shock. Treat the pool with algaecide when chlorine has fallen below 5. Prevent pressure buildup in your filter by cleaning it often to remove the dead algae.