There’s nothing more frustrating than seeing your beautiful custom spa pool turn green. Algae growth is a common problem for spa owners, but it doesn’t have to ruin your relaxation.
At Auckland Pools, we have the expertise and products to help you fight back. Here’s everything you need to know about ensuring your spa is always sparkling and ready to enjoy
Let’s start by understanding what algae is.
Algae are tiny, plant-like organisms that grow best in warm water. In custom spa pools, with their special features and finishes, algae can cling to surfaces, spread through the water, and multiply rapidly when conditions are favourable.
Here are the most common types:
- Green algae: The most common. It causes cloudy water and slippery surfaces.
- Mustard or yellow algae: Less common but harder to remove due to its resistance to chemicals.
- Black algae: The most stubborn, often showing up as dark spots on pool surfaces.
Even with chlorine or bromine treatments, algae can still grow if the chemical balance is off, the water is too warm, or circulation isn’t sufficient.
What Causes Algae Growth?
Algae can enter your spa in many ways: through swimwear, leaves, wind, or rain. Whether it takes hold depends on a few key things:
- Imbalanced water chemistry: pH, chlorine, or bromine levels outside their ideal ranges.
- Poor filtration: Dirty or inefficient filters don’t catch contaminants effectively.
- Lack of water movement: Stagnant water, especially in corners or near jets, creates perfect algae conditions.
- Infrequent cleaning: Buildup of oils, sweat, leaves, and dirt can feed algae.
- Warm temperatures: Spa water is warmer than regular pools, which makes it easier for algae to grow.
How to Prevent Algae Growth in Your Custom Spa Pools
Taking a proactive approach to spa pool care is essential. Here are some strategies we recommend to clients across Auckland to keep custom spa pools algae-free and sparkling clean:
1. Maintain Proper Water Chemistry
Regular testing and balancing of your spa water is one of the most effective ways to prevent algae. Aim for the following levels:
- pH: Between 7.2 and 7.6
- Sanitiser (chlorine or bromine): Typically 3 to 5 parts per million (ppm) for chlorine
- Total alkalinity: Between 80 and 120 ppm
It’s best to test your water two to three times a week using either test strips or a quality digital tester. Many of our clients find digital smart testers particularly quick and accurate.
2. Use a High-Quality Spa Cover
A good spa cover is one of the easiest ways to prevent algae. It keeps out leaves, debris, and rainwater, all of which can throw off your water chemistry. A well-fitted, insulated cover also helps maintain temperature and chemical levels. Always keep it securely in place when your spa isn’t being used.
3. Regularly Clean and Circulate Spa Water
Daily circulation helps keep your water moving and reduces the chance of stagnant spots, which algae love. Make sure jets are reaching all areas, including steps and behind headrests.
In addition to circulation:
- Rinse the spa filter weekly and deep clean it at least once a month
- Wipe down spa surfaces or vacuum weekly to remove buildup
- Use a net or skimmer to clear out floating debris regularly
4. Shock the Water Periodically
Shocking your spa involves adding a strong dose of chlorine or a non-chlorine oxidiser. This helps break down organic matter, prevent chloramine build-up, and stop algae from taking hold early.
If your spa gets frequent use or after a storm, it’s a good idea to shock it once a week. Just make sure the product you use works with your existing sanitiser system.
5. Use Algaecide Formulated for Spa Pools
Algaecide can add an extra layer of protection, especially if your spa is in a leafy area or gets used often. Make sure you use an algaecide that’s specifically made for spa pools. Pool-grade algaecides can cause foaming or irritation in warm water.
Use it sparingly and always follow the manufacturer’s instructions.
How to Treat Algae Growth in a Custom Spa Pools
Despite diligent care, algae may still occasionally appear. When that happens, the following steps will help you treat it effectively:
Step 1: Identify the Algae Type and Problem Areas
Inspect your spa pool water and surfaces carefully. Is the water cloudy or discoloured? Are there slippery patches or visible algae spots on the spa shell or behind headrests? Correctly identifying the algae type will help determine the appropriate treatment.
Step 2: Thoroughly Clean Your Spa Pool
- Remove and clean or replace the filter as needed.
- Vacuum debris from the spa floor.
- Brush all surfaces, especially around jets, steps, and hard-to-reach corners.
- If algae growth is severe, consider draining the spa completely for a deep clean.
Step 3: Rebalance the Water Chemistry
After cleaning, test the water and adjust the chemical levels. Increase sanitiser concentration slightly to help eradicate any remaining algae spores. If the spa has been drained, refill with fresh, balanced water.
Step 4: Shock the Spa Water with a High Dose Treatment
Add a double dose of shock treatment to the water and leave the cover off to allow gases to dissipate. Run the circulation system for several hours to ensure the treatment is evenly distributed.
Step 5: Apply Spa-Safe Algaecide if Needed
If algae persists after shocking, apply a spa-safe algaecide following the manufacturer’s instructions. Avoid overuse, as excessive algaecide can affect water clarity and comfort.
Step 6: Repeat Treatment as Required
For severe algae outbreaks, repeat these steps over several days. In extreme cases, a full system flush and complete water replacement may be necessary.
Maintenance Tips for Custom Spa Pools
Although algae can be a nuisance, implementing a few simple maintenance habits ensures your custom spa pool remains clear, clean, and inviting. Experience shows that consistent care prevents larger problems, and expert assistance can make all the difference.
The best way to prevent future algae issues is to start with a superior product. At Auckland Pools, our custom spas are designed and built with materials and technology that make maintenance easier and more effective.
- High Quality, Non-Porous Finishes: Our spa surfaces are crafted to be smooth and non-porous, preventing black algae from establishing itself. This makes algae much easier to remove with regular brushing and cleaning.
- Superior Circulation and Filtration: Our expertly engineered systems are designed to minimise “dead spots” and ensure every part of your spa receives uniform circulation and filtration. This means fewer opportunities for algae to grow unnoticed.
- Expert Design: We consider everything in our design process, from the placement of jets to the quality of our plumbing, to create a system that is efficient and easy to maintain.
Wrapping Up: Keeping Your Spa Pool Clean and Algae-Free
At Auckland Pools, we provide maintenance services to keep your custom spa pool running smoothly. Our team handles everything from regular water testing and cleaning to equipment servicing and chemical balancing. We also offer expert advice tailored to your spa’s needs, ensuring it stays clean, safe, and enjoyable all year round with minimal effort on your part.
For expert spa maintenance and advice, contact our team today.