How to Clear Green Algae in Swimming Pools with Sand Filters

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Clearing your pool of green algae makes it useable again.
Clearing your pool of green algae makes it useable again. (Image: Comstock Images/Comstock/Getty Images)

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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