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How to Identify and Remove Pool Stains




Maintaining a pristine pool in Australia isn't always as simple as keeping the water clear. Pool stains can appear even in the best-kept pools, marring your backyard oasis.


Fortunately, identifying and removing these pool stains is a manageable task once you understand the different types of stains and the appropriate treatments for each. 



What Causes Pool Stains?

Pool stains generally fall into two categories: organic and metal stains. Understanding the cause of the stain will help you select the most effective treatment.


Organic Stains

These stains often result from natural debris like leaves, berries, twigs and algae that have settled on your pool's surfaces.


Metal Stains

These stains can be more insidious, coming from sources such as corroded copper pipes, metal pool accessories, or even well water. Metals like iron, copper, and manganese can cause various colours of staining in your pool.



Identifying Pool Stains

The first step in treating pool stains is accurate identification. The colour of the stain can provide clues about its origin.


  • Green and Brown Stains

    These are typically organic stains from leaves, plant matter or algae.


  • Red or Blue Stains

    Such stains are often from berries or fruit that have fallen into the pool.


  • Blue or Greenish-Black Stains

    These stains can indicate the presence of copper, either from corroded plumbing or well water.


  • Greenish-Brownish-Red Stains

    Iron in your water supply or rust from nearby metal objects can cause these stains.


  • Brownish-Blackish-Purple Stains

    Manganese, commonly found in well water, can lead to these darker stains.



How to Remove Pool Stains

Once you've identified the kind of stain in your pool, the next step is removal. The techniques vary slightly depending on whether the stain is organic or metallic.


Removing Organic Pool Stains


  • Test and Balance the Water: Ensure the alkalinity is between 100ppm and 150ppm and the pH is between 7.4 and 7.6.


  • Shock the Pool: Add chlorine shock to the pool according to the product’s instructions, preferably at night to maximise effectiveness.


  • Brush the Pool: Use a pool brush to scrub the stained areas.


  • Run the Pump Overnight: Circulate the water to distribute the chlorine and remove loosened debris.


  • Brush Again: Scrub any remaining stains the next day.


  • Repeat if Necessary: Persistent stains may require multiple rounds of shock and brushing.



Removing Metal Pool Stains


  • Determine the Stain: Use a test kit or take a water sample to a local pool store to identify the specific metal causing the stain.


  • Choose the Right Metal Pool Stain Remover: Select a product designed to remove the specific type of metal stain.


  • Follow Manufacturer’s Instructions: Apply the remover according to the instructions provided.


  • Scrub and Filter: Scrub the stained areas and run your pool filter to help remove the dissolved metals from the water.


  • Repeat if Necessary: Similar to organic stains, metal stains might also require multiple treatments.



pool stain remover



How to Prevent Pool Stains


Prevention is always better than cure. Implement these strategies to keep your pool free from unsightly stains.


Preventing Organic Pool Stains


  • Maintain Water Balance

    Regularly test and adjust the pH, alkalinity, and sanitiser levels.


  • Regular Cleaning

    Use an automatic pool cleaner or manually vacuum the pool regularly.


  • Skim the Surface

    Remove debris like leaves and twigs before they sink and cause stains.


  • Mind Your Landscaping

    Avoid planting fruit-bearing trees and shrubs near the pool.


  • Inspect Regularly

    Check your pool frequently for signs of staining and address them promptly.


Preventing Metal Pool Stains


  • Test Your Water Source

    Before filling your pool, test for metals and use a hose filter if necessary.


  • Use Metal Sequestrants

    These chemicals bind to metal particles, preventing them from settling on pool surfaces.


  • Maintain Pool Plumbing

    Regularly inspect copper pipes for corrosion and replace them as needed.


  • Regulate pH Levels

    Keep the pH of your pool water balanced to prevent metal corrosion.



Frequently Asked Questions


1. How do I test for metals in my pool water?

You can purchase home test kits to detect metals or take a water sample to your local pool store for professional testing.


2. How often should I shock my pool to prevent stains?

Regular shocking, once every 1-2 weeks, can help maintain clean water and prevent organic stains from forming.


3. Can metal sequestrants be used in any pool?

Yes, metal sequestrants are safe for all types of pools and are particularly effective if you have a known issue with metal staining.


4. Is it safe to swim immediately after adding a metal stain remover?

Always follow the manufacturer's guidelines. Most recommend waiting until the chemical has circulated fully and the pool has been tested again before swimming.


5. What is the best way to remove stubborn stains that do not respond to initial treatments?

Persistent stains may require professional intervention. Consult with a pool maintenance expert who can provide more intensive treatment options.


At Algaefree Australia, we understand that maintaining a stain-free pool can be challenging. However, with our expert advice and high-quality products, you can enjoy a pristine swimming environment year-round. Need help with stubborn pool stains? Contact us today!

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