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Algae in a swimming pool can come in several varieties. One of the most common types is green pool algae. These algae are found in local waterways, like streams and ponds, and are easily cross-contaminated into swimming pools. 

While green algae isn’t deadly, it’s indicative of a poorly treated pool. It can show that your pool water is contaminated and your sanitizers aren’t effectively working to clean it. 

Continue reading if you hope to understand these algae issues better and clear them from your pool. We’ll help you get your water balanced and prevent future growth. 

What’s the Best Way to Kill Algae Pool Algae? 

There’s not one way to kill algae in your pool water. It’s a several-step process that includes scrubbing, skimming the surface for debris, and adding sanitizing chemicals. 

Follow this step-by-step process tto clean algae out of your swimming pool thoroughly:

  1. Set up your pool scrub brush 
  2. Use your brush to scrub all the algae from your walls and floor 
  3. Use a small brush to remove any algae from the tiles on the walls 
  4. Vacuum the pool 
  5. Skim the surface of the pool with a pool net 
  6. Add shock treatment or algaecide to the pool water as the manufacturer directs
  7. Let the filter run for a few hours 

Be extra careful to remove all the lingering algae from the walls and floor to ensure nothing grows back. It only takes one spore to create algae bloom in the pool. Let your filter run for at least 8 hours after adding the chemicals to ensure they circulate throughout the pool.

What’s the Quickest Way to Kill Algae in the Pool? 

Algaecide and shock treatments are the quickest methods for killing algae in your swimming pool. Depending on how bad your pool’s algae issue is, you might be able to get by with just a quick chemical treatment. 

Chemicals won’t be enough if your pool looks very green and you notice algae clinging to the walls, floor, and inside the skimmer. Algae can survive chemical treatments if they’re stuck to the walls or floor. Once the high chemical levels go down, the algae can bloom back. 

However, if the algae doesn’t seem to be too severe, but you see your pool getting green, adding chemical treatments can nip it in the bud. Add a triple dose of chlorine shock to the water and run the pump all night. 

After 24 hours add algaecide to prevent the algae from coming back. 

What’s the Most Natural Way to Kill Algae? 

There’s no natural method to kill algae in a swimming pool. However, you can use baking soda (sodium bicarbonate) to kill algae growing in the cracks and crevices of your pool tiles. 

Use a small scrub brush (or toothbrush) and apply the baking soda to the affected area. Gently scrub the algae growth or stains with the brush to remove the lingering algae. 

Why Does Algae Grow in the Swimming Pool? 

The most significant cause of algae blooms in a swimming pool is unbalanced pool chemicals and pH. If your swimming pool has a lot of algae and keeps coming back, you probably have base water. 

Base water is too alkaline and doesn’t contain enough acid. The acid in water is essential for making your pool water uninhabitable for bacteria and algae. You don’t want your water to be too acidic, though, or it can impact how well your chlorine and other sanitizers work. 

Keep your pool water balanced or neutral. Neutral water is the perfect balance between acidic and base, making it ideal for pool chemicals and sanitizers to do their job. Keep your pool water’s pH at between 7.4-7.6 to keep the algae at bay. 

Is it Safe to Swim with Green Pool Algae? 

Green algae aren’t necessarily dangerous, but you should avoid swimming in the pool when you have this growth. Algae growths signify that your pool water chemistry is off-balanced; thus, bacteria can also be lingering in the water. 

If you accidentally drink or get the water in an open wound, you can get infected with the bacteria. However, most of the time, you won’t experience any severe infections by swimming in a pool with green algae. 

Although you can experience stinging eyes and skin thanks to the water pH being off-balanced. This can lead to annoying skin and eye irritations. 


Algae growth in a swimming pool can throw a wrench in all your plans to throw your pool party or picnic. It’s slimy, it gets into your hair, and it can stain your pool walls and floor. The best way to treat this issue is to add significant amounts of shock to the water after scrubbing the pool. 

We hope this article got you closer to achieving your goals of a crystal clear pool. If you’d like to learn more about different types of pool algae, check out our other blog posts today.