How to Handle Stubborn Pool Algae: Removal and Prevention Tips

Pool algae can be a nightmare for any pool owner. Whether your pool is green, cloudy, or has unsightly black or mustard-colored streaks, algae can quickly transform your pristine backyard oasis into a mess. If you’re struggling with persistent algae, you’re not alone—many pool owners face this challenge. But don’t worry! In this comprehensive guide, we’ll cover everything you need to know about how to remove stubborn pool algae, prevent it from returning, and keep your pool looking sparkling clean all year round.

Understanding Pool Algae: What is it and Why Does it Grow?

Before we dive into how to tackle algae, it’s essential to understand why algae appears in the first place. Algae are tiny aquatic plants that thrive in the presence of sunlight, heat, and nutrients—particularly phosphates and nitrates. The main culprits behind algae growth in pools are poor circulation, inadequate sanitation, or incorrect chemical levels. Whether it’s caused by a neglected pool, improper pool maintenance, or an extended period of hot weather, once algae takes hold, it can be stubborn and tricky to get rid of.

Common Types of Pool Algae

Algae comes in various forms, and each type presents its own set of challenges. Knowing what you’re dealing with is key to effectively removing it:

Green Algae: This is the most common type of pool algae. Green algae can spread rapidly and cause your pool water to become cloudy and green.
Black Algae: Black algae are resistant to most pool chemicals and are typically found on pool walls. These algae can form deep root systems, making them harder to treat.
Mustard Algae: This yellowish algae often forms on pool floors and in shaded areas. It's less harmful but can still be tricky to get rid of.
Pink Algae: Though technically a bacteria, pink algae can appear in pools, especially in damp areas like around the pool’s edges.

How to Remove Stubborn Pool Algae: Step-by-Step Guide

Now that we know what we’re dealing with, let’s look at the practical steps to remove algae and restore your pool to its crystal-clear state.

1. Test and Adjust Pool Chemistry

The first step in any pool algae treatment is ensuring that your pool’s chemicals are balanced. Algae thrive when the pool’s pH and chlorine levels are off. Here’s what to check:

pH Levels: Keep the pH between 7.4 and 7.6.
Chlorine Levels: Ensure the chlorine is between 2.0 and 4.0 ppm.
Total Alkalinity: The ideal range is 80-120 ppm.
Stabilizer (Cyanuric Acid): The stabilizer helps chlorine last longer in the sun and should be kept between 30-50 ppm.

You can use a pool water test kit to check these levels, and if any are out of range, adjust them accordingly using the appropriate pool chemicals.

2. Brush and Scrub Your Pool

Once your pool’s chemistry is balanced, it’s time to scrub. Algae often cling to the walls, floor, and steps of your pool. Use a pool brush with stiff bristles to scrub the surfaces, paying extra attention to areas where algae have taken hold. This will help break up the algae, making it easier for your pool filter and chemicals to remove it.

Pro Tip:

If you have black algae, use a wire brush to target the stubborn roots. Black algae are more resistant to chlorine, so physically scrubbing the pool is essential.

3. Shock Your Pool

Shocking your pool involves adding a large dose of chlorine (or pool shock) to kill algae and other contaminants in your pool water. Pool shock is typically available in granule or liquid form. Here’s how to shock your pool:

Add shock to the pool in the evening to prevent the chlorine from being broken down by the sun.
Follow the manufacturer’s instructions for the correct amount of shock based on your pool’s size.
Turn on the pool filter and let the pool circulate for at least 8 hours. This will help spread the shock throughout the water and begin killing off the algae.

4. Use an Algae-Cide

After shocking the pool, apply a high-quality algaecide specifically designed for the type of algae you’re dealing with. Algaecides are chemical treatments that kill algae spores and prevent them from returning. For persistent algae problems, you may need to apply the algaecide multiple times.

Pro Tip:

For black algae, choose a copper-based algaecide, as it’s more effective against this resistant variety. Mustard algae requires a specific algaecide, often labeled “mustard algae treatment.”

5. Run the Pool Filter 24/7

For at least 48 hours after applying chemicals, run your pool filter continuously. The filter will help capture dead algae particles and keep your pool water circulating, preventing any algae from settling. Clean the filter frequently to avoid clogging and ensure it’s working efficiently.

6. Vacuum Your Pool

Once the algae starts to die off, you’ll likely notice debris and dead algae floating in the water. Use a pool vacuum to remove this debris. This is crucial, as leftover algae can cause the pool to turn cloudy or even trigger a new algae bloom.

7. Backwash or Clean the Pool Filter

After you’ve vacuumed the pool, make sure to backwash your filter or clean your filter cartridge thoroughly to remove any trapped algae and debris. This will prevent the algae from re-entering the pool water.

How to Prevent Algae from Coming Back

Now that your pool is clean, it’s essential to take steps to prevent algae from returning. Here are some tips for algae prevention:

1. Maintain Proper Pool Chemistry

Consistently maintain your pool’s chemical levels within the recommended range. Regular testing (at least once a week) is crucial to preventing algae and ensuring optimal water conditions.

2. Regular Pool Cleaning

Skim debris off the water’s surface daily and scrub the pool walls and floor weekly to keep algae from gaining a foothold. Don’t forget to clean the pool filter on a regular basis.

3. Improve Pool Circulation

Ensure that your pool’s circulation system is working efficiently. Poor circulation leads to stagnant water where algae can thrive. Adjust the pool jets to ensure even water distribution, and clean the pump and filter regularly.

4. Install a Pool Cover

When your pool isn’t in use, cover it to prevent debris and leaves from falling into the water. This helps reduce the organic matter that algae feed on, lowering the chances of an algae bloom.

5. Use Algaecide Regularly

A preventative algaecide can be added to your pool once a month, especially during the hotter months. This will help keep algae from forming and maintain the pool’s clarity.

6. Consider a Pool Salt System

Saltwater pools are less prone to algae growth because the salt system generates chlorine consistently, providing constant sanitization. While saltwater systems require initial installation and setup, they can be a worthwhile investment in preventing algae and maintaining healthy water.

Conclusion:

Dealing with stubborn pool algae can feel like an overwhelming task, but by following these tips, you’ll be well on your way to restoring your pool to its sparkling best. Remember to maintain your pool’s chemistry, scrub and shock it regularly, and use effective algaecides. And don’t forget that prevention is key—consistency is your best defense against algae.

If you’re looking for expert help with your pool care, The One Pool Care is your trusted partner for all pool maintenance needs.

By staying proactive with cleaning, chemistry, and maintenance, you can enjoy a clean and clear pool throughout the swimming season—no more green, black, or mustard algae to spoil your fun!