**Austin Algae: Is Pool Sunscreen Brewing Summer Yeast?**
By Franklin Everett ShawThe shimmering turquoise of an Austin pool is a siren song in the Texas heat. But beneath that inviting surface lurks a hidden world, a microscopic battleground where algae, sunscreen, and pool chemicals clash, often leaving you with more than just a refreshing dip. We’re not talking about your run-of-the-mill green pool; we’re talking about the stubborn, resistant strains that thrive in the unique Austin environment, and how your well-intentioned pool care might actually be making things worse.
Austin pools face a unique set of challenges. The intense Texas sun, combined with the specific mineral composition of our water and the heavy sunscreen use, creates a perfect storm for resistant algae and even yeast overgrowth.
Let’s dive into the specific algal culprits plaguing Austin pools.
Mustard Algae (Yellow Algae): This isn’t your typical green algae. Mustard algae, often mistaken for dirt or sand, is chlorine-resistant and clings stubbornly to pool walls, especially in shaded areas. It’s particularly prevalent in older Austin neighborhoods with mature trees providing ample shade.
Green Algae: The most common type, green algae, can quickly turn a pool cloudy and green. In Austin, the rapid temperature fluctuations can cause blooms to appear seemingly overnight.
Black Algae: This is the most difficult to eradicate. Black algae forms a thick, protective layer, making it highly resistant to chlorine. It often appears in the grout lines of tiled pools, a common feature in many older Austin homes.
Now, let’s talk sunscreen. It’s essential for protecting your skin, but many common sunscreen ingredients, like oxybenzone and octinoxate, break down in pool water and can act as a food source for algae and bacteria. Furthermore, they can react with chlorine to form disinfection byproducts (DBPs), some of which are harmful.
The real problem arises when these factors combine. The sun breaks down sunscreen, feeding the algae. The algae, in turn, can develop resistance to chlorine, especially if you’re not maintaining proper levels. This resistance can lead to the formation of biofilms – slimy layers of microorganisms that are incredibly difficult to penetrate with traditional sanitizers.
And here’s where it gets even more specific to Austin: the hard water. Austin’s water is notoriously hard, meaning it contains high levels of calcium and magnesium. These minerals can interfere with the effectiveness of chlorine and other sanitizers, making it even harder to control algae growth.
Furthermore, the warm, humid climate of Austin is also conducive to yeast growth. While not directly related to algae, the same conditions that promote algae growth can also create an environment where yeast thrives, leading to potential skin irritations and infections, especially for children.
So, what can you do to combat these Austin-specific pool problems?
First, identification is key. Don’t just assume it’s “regular” algae.
Mustard Algae: Look for a yellowish-brown, powdery substance on the pool walls, especially in shaded areas. It often brushes off easily but returns quickly.
Green Algae: Cloudy green water is the obvious sign.
Black Algae: Dark, raised spots, often in grout lines. They feel rough to the touch.
Once you’ve identified the type of algae, you need to take action. But simply shocking the pool with chlorine might not be enough, especially if you’re dealing with resistant strains or biofilms.
Here’s a step-by-step guide to sanitizing your Austin pool, focusing on alternative methods and preventative measures:
Test Your Water: Get a comprehensive water test done at a local Austin pool supply store (like Pinch A Penny or Leslie’s Pool Supplies). This will give you a detailed analysis of your water’s pH, alkalinity, calcium hardness, and chlorine levels. Don’t rely solely on test strips; a professional test is crucial.
Clean Thoroughly: Brush the entire pool surface, paying close attention to areas where algae is visible. Vacuum the pool to remove any debris. Clean or backwash your filter.
Consider a UV Sanitizer: UV sanitizers use ultraviolet light to kill algae, bacteria, and viruses without adding chemicals to the water. This is a great option for reducing chlorine use and minimizing the risk of chemical resistance. They are readily available at Austin pool supply stores and online.
Use an Algaecide: Choose an algaecide specifically designed for the type of algae you’re dealing with. For mustard algae, look for a copper-based algaecide. For black algae, you might need a more potent algaecide containing quaternary ammonium compounds. Follow the manufacturer’s instructions carefully.
Shock the Pool (If Necessary): If you choose to shock the pool, use a non-chlorine shock (like potassium monopersulfate) to avoid exacerbating chlorine resistance.
Maintain Proper Water Chemistry: This is crucial for preventing future algae blooms. Keep your pH between 7.2 and 7.8, your alkalinity between 80 and 120 ppm, and your calcium hardness between 200 and 400 ppm.
Rinse Swimsuits: Encourage swimmers to rinse off before entering the pool to remove sunscreen and other contaminants.
Consider Sunscreen Alternatives: Look for mineral-based sunscreens containing zinc oxide or titanium dioxide. These are less likely to break down in pool water and contribute to algae growth.
Common Pitfalls and How to Avoid Them:
Not Brushing Thoroughly: Algae clings to surfaces, so brushing is essential for removing it and allowing the sanitizer to reach it.
Using the Wrong Algaecide: Different algaecides are effective against different types of algae. Using the wrong one will be a waste of time and money.
Not Maintaining Proper Water Chemistry: This is the most common mistake. Even if you successfully kill the algae, it will likely return if your water chemistry is not balanced.
Ignoring the Filter: A dirty filter can harbor algae and bacteria, re-contaminating the pool water.
Over-Reliance on Chlorine: Overusing chlorine can lead to resistance and the formation of harmful DBPs.
Local Austin Resources:
Austin Water Utility: They offer information on water quality and hardness.
Local Pool Supply Stores: Pinch A Penny, Leslie’s Pool Supplies, and other local stores offer water testing, chemicals, and equipment.
Professional Pool Cleaning Services: Consider hiring a professional pool cleaning service for regular maintenance or for dealing with stubborn algae problems. Many Austin-based companies specialize in green pool cleanups.
By understanding the specific challenges that Austin pools face and taking proactive steps to prevent and remediate algae growth, you can keep your pool sparkling clean and safe for swimming all season long. Don’t let those microscopic invaders ruin your summer fun! Remember, a little extra effort and knowledge can go a long way in the battle against Austin’s unique pool problems.