How To Remove Algae From Pool Without Chemicals

Understanding Pool Algae and Why It’s a Problem

If you own a pool in New Zealand, you’ve probably come across algae at some point. While it’s not harmful in itself, it can quickly turn your beautiful pool into an unsightly green, yellow, or even black mess. Algae thrives in warm, stagnant water, particularly if there’s poor circulation or inadequate filtration.

Many pool owners immediately turn to chemical treatments like chlorine and algaecides, but if you’re looking for a natural way to remove algae from your pool, there are several effective alternatives.

Increase Filtration and Circulation

The first step in tackling algae naturally is to boost your pool’s filtration and circulation. Algae thrives in stagnant water, so keeping the water moving can help prevent growth.

Run your pool pump longer – Instead of running it for just a few hours a day, consider running it for 12 to 24 hours until the algae clears up.
Check and clean your pool filter – A clogged or dirty filter can make it harder to clear algae. Rinse or backwash your filter regularly.
Use a robotic pool cleaner – If you have one, let it run frequently to help remove algae and debris from the pool floor and walls.

You can find pool filters and cleaners from New Zealand-based retailers such as Para Rubber and Pool & Spa Warehouse.

Brush and Vacuum the Pool

Physically removing algae is one of the most effective non-chemical methods. Regular brushing dislodges algae, while vacuuming removes loosened algae from the water.

Use a stiff pool brush for concrete or plaster pools, and a softer brush for vinyl or fibreglass pools.
Scrub walls, steps, and the pool floor to loosen the algae so it can be filtered out.
Manually vacuum the pool or use an automatic pool cleaner to remove algae debris.

For reliable pool cleaning tools, check out Bunnings NZ or The Swimming Pool Warehouse.

Use Natural Alternatives to Kill Algae

If you prefer to avoid chemicals, there are several natural treatments you can use:

1. Baking Soda for Black Algae

Black algae is one of the toughest to remove. Baking soda contains bicarbonate, which loosens black algae from the surface.

Sprinkle baking soda directly onto black algae spots.
Scrub firmly with a brush to break the roots.

You can buy baking soda in bulk from Countdown or Pak’nSave.

2. Hydrogen Peroxide (Food-Grade 35%)

Hydrogen peroxide is a natural oxidiser that helps break down algae cells without harming your skin or pool surfaces.

Pour food-grade hydrogen peroxide into the water (check appropriate dosage based on pool size).
Run the filter and circulation system to distribute it throughout the pool.

Hydrogen peroxide can sometimes be found at natural health stores like Huckleberry or specialty chemical suppliers.

3. Barley Straw for Prevention

Barley straw is a popular natural algae preventative. As it decomposes in water, it releases compounds that inhibit algae growth.

Place barley straw bales in mesh bags and let them float in the pool.
Replace every few months for ongoing prevention.

Barley straw can be sourced from local garden centres such as Kings Plant Barn.

Keep the Pool Clean and Balanced

Regular pool maintenance plays a huge role in preventing algae without using chemicals.

Maintain proper pH levels – Aim for a pH between 7.2 and 7.6 to discourage algae growth.
Regularly skim debris – Leaves and organic material can introduce nutrients that help algae grow.
Shock your pool with the sun – Sunlight naturally helps sanitise water; letting your pool get some direct sunlight can be beneficial.

For pool testing kits and maintenance advice, check Mitre 10 or Placemakers.

Natural Algae Prevention Tips

Preventing algae is always better than dealing with a full-blown infestation. Here are a few key tips to keep your pool algae-free:

✅ Shower before swimming – Body oils, lotions, and organic materials can introduce nutrients that feed algae.
✅ Use a pool cover – This helps reduce debris accumulation and prevents excessive water evaporation.
✅ Regularly check your filter – Ensure it’s clean and functioning properly to prevent stagnant water.
✅ Consider adding aquatic plants – If your pool is more of a natural pond, plants like water lilies can help control algae by competing for nutrients.

Enjoying a Clean, Chemical-Free Pool

By using natural methods such as improved circulation, brushing, vacuuming, and alternative algae treatments, you can maintain a sparkling-clean pool without relying on harsh chemicals. Regular maintenance is key to avoiding future algae problems, so staying on top of cleaning and filtration will help keep your pool in top condition.

If you’re looking for more advice or specific pool products, many Kiwi retailers offer eco-friendly solutions to help maintain your pool without chemicals. Happy swimming!

Pool Owners New Zealand