Common Pool Algae Problems and How to Prevent Them

Pool algae can quickly turn a backyard paradise into a murky mess. Algae growth is not only unsightly but can also make pool surfaces slippery and unsafe, and it’s surprisingly common—even in well-maintained pools. The good news? With a few simple prevention tips, you can keep your pool algae-free all season long. Here’s a guide to the different types of pool algae, what causes them, and how to keep them out of your pool. Understanding pool water chemistry is essential for a successful pool season. If you're unfamiliar with balancing pool chemicals, check out our blog for a helpful guide.

Green Algae: The Most Common Culprit

Green algae is by far the most common type of pool algae. It can appear on the pool walls, floor, or float freely in the water, giving it a cloudy, green hue.

• Causes: Green algae often take hold due to imbalanced chemicals, warm temperatures, and a lack of circulation.
• Prevention Tips:some text
  • Keep Chlorine Levels Steady: Ensure chlorine levels stay between 1.0-3.0 ppm. Algae thrive in low-chlorine conditions.
  • Regular Brushing and Vacuuming: Scrub pool surfaces weekly, especially in shaded areas where algae are more likely to grow.
  • Use an Algaecide: A weekly dose of algaecide can prevent algae spores from gaining a foothold.

Pro Pool Tip: If you keep adding chlorine without seeing any effect, it may be time to replace the water. Yes, draining the pool, refilling it, and rebalancing the chemicals can help restore proper water quality.

By following these steps and scheduling routine maintenance with FTG Pool Service & Repair, green algae can be kept at bay, keeping your pool fresh and clean.

Yellow (Mustard) Algae: A Tricky Type to Remove

Yellow or mustard algae are rarer but can be more stubborn than green algae. It tends to cling to pool walls and surfaces and can look like a pollen or sand buildup.

• Causes: Mustard algae often resist chlorine and thrive in shaded areas, attaching to pool walls, floors, and even pool toys.
• Prevention Tips:some text
  • Shock the Pool Regularly: Mustard algae require a higher chlorine dose, so regular shocking (about every two weeks) can help prevent its growth.
  • Remove and Clean Pool Accessories: Wash pool toys, floats, and swimsuits that have been in the pool, as they can harbor algae spores.
  • Scrub Walls Thoroughly: Use a strong pool brush to remove any algae clinging to the pool’s surfaces.

For added protection against mustard algae, FTG Pool Service & Repair offers in-depth cleaning services designed to address stubborn algae.

Black Algae: The Toughest Algae to Treat

Black algae are rare but highly resilient, appearing as black or dark blue spots. It’s known for its protective layers that make it resistant to standard pool chemicals.

• Causes: Black algae usually enter pools through contaminated equipment or swimwear, and they can latch onto rough or porous surfaces like pool plaster.
• Prevention Tips:some text
  • Brush with a Stiff Bristle Brush: Use a specialized brush to remove the algae’s protective outer layer so treatments can penetrate.
  • Shock and Add Algaecide: Double up on algaecide and apply shock treatments specifically for black algae to keep it from taking hold.
  • Avoid Porous Pool Surfaces: If you're building or resurfacing a pool, consider smoother surfaces that discourage algae growth.

Causes of Algae Blooms and Prevention Basics

While different types of algae have unique characteristics, they generally take advantage of similar conditions:

• Warm Water: Algae grow best in warm temperatures, so maintenance may need to be more frequent during summer.
• Imbalanced Chemicals: Maintaining balanced pH, alkalinity, and chlorine levels is key.
• Poor Circulation: If your pool’s circulation is poor, some areas can become stagnant, creating prime conditions for algae.

FTG Pool Service & Repair helps pool owners maintain these essentials, providing guidance on managing algae blooms throughout the seasons.

Weekly Prevention Tips for a Clear Pool

• Test and Balance Chemicals: Test your water regularly to ensure pH, chlorine, and alkalinity are in balance.
• Run the Pump Daily: Keep your pump running for at least 8 hours a day to maintain proper circulation.
• Brush and Vacuum: Clean all pool surfaces weekly to remove any spores before they grow.
• Shock Your Pool After Heavy Use: Large gatherings or rainstorms can disrupt the chemical balance. Adding shock after these events can prevent algae from taking hold.

Need Help with Stubborn Algae? Give FTG Pool Service & Repair a Call!

Dealing with persistent algae can be a hassle, but you don’t have to do it alone. Our expert team at FTG Pool Service & Repair offers comprehensive pool maintenance, including algae treatments and prevention plans, to keep your pool crystal clear and inviting. Contact us today for more tips, advice, or to schedule a service!