The Natural Approach to Pool Algae Removal

Owning a pool in New Zealand is a luxury that comes with responsibilities—one of the biggest being keeping algae at bay. Many homeowners prefer to avoid harsh chemicals, whether for health reasons, environmental concerns, or just to reduce maintenance costs. Thankfully, there are effective ways to remove algae naturally while keeping your pool safe and swimmable.

Understanding Algae Growth in New Zealand Pools

Algae thrive in warm, stagnant water, especially when the pool isn’t maintained regularly. In New Zealand, our mix of humid summer days and occasional heavy rainfall creates ideal conditions for algae to spread. Sunlight also plays a big role in algae growth, so pools that get a lot of direct exposure may see blooms more frequently.

Some of the most common types of algae found in Kiwi pools include:

• Green algae – The most widespread type, making pool water murky and slimy.
• Black algae – Harder to remove as it forms strong roots in pool surfaces.
• Mustard algae – Yellowish and often mistaken for sand or dirt.

How to Remove Algae Without Chemicals

If you prefer to keep your pool chemical-free, there are effective methods for controlling and removing algae naturally:

1. Use a Pool Brush and Manual Vacuum

One of the simplest solutions is regular brushing and vacuuming. Algae cling to pool walls and floor surfaces, so using a stiff-bristled brush will help loosen it. After brushing, manually vacuuming (not using an automatic pool cleaner) will prevent the algae from circulating back into the pool.

👉 Tip: Check out local stores like Bunnings NZ or Mitre 10 for good-quality pool brushes and vacuums.

2. Increase Circulation with a Pool Pump

Algae thrive in stagnant water, so keeping your pump running for longer each day can help prevent growth. If your pool pump isn’t running at least 8-12 hours a day, consider increasing this time or upgrading to a more efficient pump model.

👉 Where to Look: Visit The Pool Warehouse NZ for energy-efficient pumps designed for Kiwi conditions.

3. Apply Natural Algaecides

While chemical algaecides are common, you can use natural alternatives like:

• Saltwater: If you have a saltwater pool, increasing the salt levels carefully can disrupt algae growth.
• Baking soda (sodium bicarbonate): Scrubbing affected areas with a baking soda paste can help break down stubborn growth.
• Barley straw: Some pool owners use barley straw bags, available from garden centres, to inhibit algae naturally.

4. Use a Solar Pool Cover

A solar pool cover not only helps regulate pool temperature but also blocks excessive sunlight, which algae need to grow. This method reduces the opportunity for algae to bloom, especially if you’re away from home for extended periods.

👉 Where to Buy: Retailers like Para Rubber NZ stock solar covers in different sizes.

5. Add Beneficial Enzymes & Pool-Friendly Bacteria

Pool enzyme treatments help break down organic matter, such as leaves and oils, that feed algae. Some New Zealand pool supply companies offer natural enzyme solutions that are safe and effective.

👉 Where to Shop: Check Pool and Spa Warehouse NZ for chemical-free treatment options.

Ongoing Prevention Tips

While removing algae naturally is possible, prevention is always the best approach:

• Regularly skim and clean debris – Leaves and dirt feed algae, so clearing them out quickly is essential.
• Keep the pH balanced – Even without chemicals, maintaining a neutral pH (between 7.2 and 7.6) can prevent excessive algae growth.
• Shock with sunshine – Letting pool water sit in direct sun after a deep clean can help kill off remaining algae naturally.

Is a Chemical-Free Pool Viable in New Zealand?

Yes! With the right approach, you can maintain a clean and inviting pool without relying on chlorine and other harsh chemicals. Natural techniques require a little more hands-on maintenance, but they’re a great eco-friendly and health-conscious alternative.

By incorporating these methods into your pool care routine, you’ll enjoy crystal-clear water throughout the swimming season—all without unwanted chemicals.

Do you have experience maintaining a chemical-free pool in New Zealand? Share your tips in the comments!