Plan the perfect garden with our interactive tool →

Is Black Algae in a Swimming Pool Harmful?

...
Swimming Pool image by PinkSkyPhotos from Fotolia.com

Black Algae Does Not Cause Illness

Swimmers will not be harmed by the presence of black algae in a swimming pool. The black or bluish-green spots will be a deterrent to swimmers; however, similar to garden weeds, black algae is a nuisance but will not, by itself, cause illness.

Black Algae Harbors Harmful Organisms

Black algae may harbor organisms, such as E. coli, which can make swimmers quite ill. In addition, swimmers will need to remain out of the water while the pool is being treated; heavy doses of chemicals such as pool shock and algaecide must circulate for several hours prior to the water chemistry reaching safe levels.

Bottom Line

Swimmers should think twice before diving into a pool affected by black algae. Algae can attract insects and harbor harmful bacteria which can make swimmers ill. Home owners should take preventative measures, such as regular brushing of pool sides and maintaining balanced chemical, to avoid black algae, if possible.

Related Articles

How to Troubleshoot Swimming Pool Scum on the Surface
How to Troubleshoot Swimming Pool Scum on the Surface
What Causes Mustard Algae?
What Causes Mustard Algae?
Problems With Pool Ionizers
Problems With Pool Ionizers
How Much Water Is in a 15-foot by 4-foot Pool?
How Much Water Is in a 15-foot by 4-foot Pool?
How to Care for Pebble Tec Pools
How to Care for Pebble Tec Pools
How to Vacuum a Doughboy Pool
How to Vacuum a Doughboy Pool
Water Softeners for Pool Water
Water Softeners for Pool Water
Cleaning Mildew Out of a Wading Pool
Cleaning Mildew Out of a Wading Pool
How to Kill Black Mold in a Swimming Pool
How to Kill Black Mold in a Swimming Pool
BBB Method Kiddie Pool Cleaning
BBB Method Kiddie Pool Cleaning
How to Remove Black Stains From a Pool's Water Line
How to Remove Black Stains From a Pool's Water Line
How to Clean Swimming Pool Walls
How to Clean Swimming Pool Walls
How to Clear Up an Above Ground Pool That Is Cloudy
How to Clear Up an Above Ground Pool That Is Cloudy
What Causes Black Algae in My Pool?
What Causes Black Algae in My Pool?
White Algae in My Pool
White Algae in My Pool
Why Does My Chlorine Level Keep Dropping in My Above Ground Pool?
Why Does My Chlorine Level Keep Dropping in My Above...
How Much Deck Do You Need Around an Inground Pool?
How Much Deck Do You Need Around an Inground Pool?
Garden Guides
×