How to Clear Green Algae in Swimming Pools with Sand Filters


Sitting around a swimming pool with your friends and family is the ideal way to spend a weekend. One way your day can be ruined is by discovering your pool is green with algae. While green algae is not a health concern for swimmers, it may be a sign that the pool is also infected with other pathogens. Clearing the algae is done with a lot of pool shock and some hard work. Regular maintenance makes sure it doesn't return.

Things You'll Need

  • Pool balancing kit
  • Pool shock
  • Pool brush
  • Balance the water in the pool using a balancing kit. Pay close attention to the pool's pH level.

  • Check your pool filter for cleanliness. If it is dirty, hose the filter to remove debris.

  • Backwash the pool's sand filter by adjusting the flow control to the backwash setting. This removes the algae and dirt from the filter.

  • Add shock to the pool water until it turns a cloudy, bluish/gray color. This kills the algae.

  • Brush the sides and bottom of the pool with a pool brush. If there are leaves and other debris on the bottom, vacuum the pool to remove them.

  • Repeat this process until the pool water clears.

Tips & Warnings

  • If the pool is extremely green, you may need to drain the water and acid wash the walls of the pool.
  • Be careful not to splash pool shock into your eyes. If this does occur, flush your eyes with clean water until it is removed.

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  • Photo Credit Comstock Images/Comstock/Getty Images
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