What Is Red Algae in Pool: Causes, Treatment and Prevention

Published September 27, 2023

As pool owners, we want to have a safe swimming environment anytime we wish to use it. Swimming is a great physical activity, and bonding means. It is why pool maintenance is necessary. It is done to keep its optimal condition. 

Yet, pool water is not 100% immune to bacteria. One of the common dilemmas for pool water is having red algae. Water, wind, swimmers, and contaminated pool accessories. All introduce these bacteria to pools. Once in the water, they can breed until red or pink slimes start growing. They begin infecting walls, corners, and surfaces. 

If you’re seeing disturbing red algae in your pool, keep reading. We’ll discuss everything you need to know about it. We’ll explain the facts, causes, treatment, prevention, and hazards. All which you need to understand as a responsible pool owner. Let’s waste no more time and get started.

What Is Red Algae in a Pool?

Red algae, occasionally called “pink slime” or “pink growths,” are bacterial growths. They exist on pool surfaces. The bacteria can grow in spots and larger patches. They can be anywhere in your pool. They can also make the water itself appear reddish. 

Red algae is disturbing. Moreover, it presents minor health risks. It frees toxins that can irritate the skin or lungs. It can cause nausea, vomiting, or dizziness. But, more of this later.

What Does Algae Look Like in a Pool?

Algae can be seen as red spots in your swimming pool. It can also appear as rusty brown spots or bright pink patches on the wall. Upon sighting, it causes all sorts of problems.  All that need vigorous pool water treatment. You also have to adjust your pool chemicals. Finally, use actions that remove the growth from the water.

What Causes Red Algae?

Bacteria are all around us. For this fact, it is not shocking that they find their way into swimming pools. 

The main source of bacteria in pools is the swimmers. We carry some bacteria as we dive in pool water because of our skin. These bacteria grow and multiply if your pool chemicals are out of balance. Conversely, they die if they are appropriately taken care of. 

Bacteria will build up in your pool water and surfaces. They will crawl on ladders, pool covers, and inflatable toys. Suppose you have a balanced pool of water. Bacteria can grow into it on the wind and rain in amounts that can override the pool’s cleaning system. You can also introduce some in your pool with your garden hose.

Is It Safe to Swim in a Pool With Algae?

No. Once you spot it, stop your pool operation until it’s well taken care of. Red algae growth in a swimming pool can be alarming. The algae release toxins. It can cause skin irritation and redness. It also triggers nausea, vomiting, and dizziness. In severe instances, the toxins can trigger respiratory problems. It’s critical to keep an eye on the algae level in your pool. You must take steps to decrease its growth. 

How to Get Rid of Red Algae? Treatment for Red Algae

1. Brushing and vacuuming 

Brushing and vacuuming the areas where red algae is present will help. Doing so will loosen and remove it from the pool surfaces. 

2. Shock treatment 

Add a high-quality pool shock treatment that explicitly targets algae. It will help kill and drop the bacteria growth.

3. Filtration and backwashing 

Running the pool’s filtration system continuously is a great idea, too. It will remove the dead algae from the water. Backwash the filter regularly to keep it clean. Further, functioning correctly. 

4. Water Balancing 

Keeping the water adequately balanced will help prevent future algae growth. Regularly test and adjust your pool’s pH. Look after the alkalinity, and chlorine levels too. All will help to maintain proper water chemistry.

5. Algaecide Treatment 

Algaecide treatment is specifically designed to target and kill red algae. You can buy some. Follow the instructions provided by the manufacturer. Remember to use proper dosage and application to avoid issues.

6. Regular maintenance 

To prevent the recurrence of red algae, you must maintain good pool hygiene. Clean the pool. Skim debris, brush your walls, and vacuum the pool floor weekly. Maintain the pool’s filtration system as well. Finally, watch your water chemistry consistently.

Preventing Red Algae in Pool: Tips and Tricks

The following routine preventive measures will aid in keeping red algae at bay: 

1. Run your garden hose for a few minutes before filling the pool. 
2. Clean your pool covers and solar rings twice a year. Change your filter material every two to three years. 
3. Have swimmers take a quick shower before dipping in the pool. 
4. Maintain a close eye on your pool water’s chemical balance. 
5. Increase sun exposure to your collection if possible. For one, trim tree branches near the area. 

Safety and Health Risks of Algae in Pool

Algae in a pool can pose safety and health risks if left untreated. Do not let it destroy your swimming environment and your well-being. 

1. Clogging of filters and plumbing 

Algae can accumulate and become thick as time passes. It can clog the pool filters and plumbing. The two impact the circulation and filtration system. As a result, you will have a decreased water quality.

2. Skin problems 

Certain types of bacteria found in algae can trigger skin problems. Swimmers can be left with uncomfortable rashes. Some may struggle with itchiness. Finally, some with irritation. 

3. Ingestion of bacteria 

Accidentally ingesting water that has algae and bacteria is harmful, too. It can lead to health issues. Some symptoms include diarrhea and fever. Moreover, abdominal discomfort.

4. Increased risk of slips and falls 

Algae growth on pool surfaces can make them slippery. As a result, it increases the risk of slips and falls. It can cause injuries.